All of Boston is on lockdown Friday morning as authorities hunt for the surviving suspect in the Boston bombing after a chaotic night which saw one of the suspects die and an MIT police officer killed.

The Associated Press has identified the two suspects as coming from the Russian region near Chechnya, which has been plagued by an Islamic insurgency stemming from separatist wars. The two young men were living legally in the U.S.

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You can learn more about Chechnya and its relationship with terror below.

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  • A police officer signals for people to get back as they conducts a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Matt Rourke)

  • Police run with their weapons drawn as they conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke)

  • Police cover as they surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Charles Krupa)

  • A neighbor is escorted to safety as police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Charles Krupa)

  • Police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Charles Krupa)

  • Police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Charles Krupa)

  • A man walks out of his home in a bath robe as police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday.(AP Photo/Charles Krupa)

  • Law enforcement officials stand guard while searching for an individual believed to be involved in the Boston Marathon explosions in Watertown, Mass., Friday, April 19, 2013. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Julio Cortez)

  • Residents are seen near a window, top, as an official wearing tactical gear stands guard while searching for an individual believed to be involved in the Boston Marathon explosions in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez)

  • Boston Marathon Explosions

    A police officer points his weapon at a residence as he conducts a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke)

  • Boston Marathon Explosions

    Police officers take cover as they conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke)

  • A barefooted woman runs for cover as police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Charles Krupa)

  • An official wearing tactical gear, left, looks on as others enter an apartment building in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez)

  • Heavily armed police continue to patrol the neighborhoods of Watertown, Mass. Friday, April 19, 2013, as they continue a massive search for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle)

  • Tactical teams drive through a neighborhood while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Charles Krupa)

  • Officials wearing tactical gear search an apartment building in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez)

  • A police officer runs with his weapon drawn as he conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke)

  • Officials wearing tactical gear search an apartment building in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez)

  • Tactical teams drive through a neighborhood while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Charles Krupa)

  • An official wearing tactical gear, right, looks on as others enter an apartment building in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez)

  • Police run with their weapons drawn as they conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke)

  • Police officers take cover as they conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke)

  • A police officer runs with his weapon drawn as he conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke)

  • A police officer signals for people to get back as they conducts a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Matt Rourke)

  • Tactical teams exit an apartment building while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Charles Krupa)

  • Heavily armed police enter a building in Watertown, Mass. Friday, April 19, 2013, as law enforcement officials continue a massive search for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle)

  • A police officer evacuates a shoeless man holding a child as members of law enforcement conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke)

  • A police officer runs with his weapon drawn as he conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist.(AP Photo/Matt Rourke)

  • Boston Marathon Explosions

    A police officer points his weapon at a residence as he conducts a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke)

  • Heavily armed police continue to patrol the neighborhoods of Watertown, Mass. Friday, April 19, 2013, as they continue a massive search for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle)

  • Boston Marathon Explosions

    A police officer with is weapon drawn conducts a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke)

  • Boston Marathon Explosions

    A police officer and a Federal Bureau of Investigation agent run as they conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The two suspects in the Boston Marathon bombing killed an MIT police officer and hurled explosives at police in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday as thousands of officers swarmed the streets in a manhunt that all but paralyzed the Boston area. (AP Photo/Matt Rourke)

  • Officials wearing tactical gear stand near an armored vehicle as they search an apartment building for one of two suspects in the Boston Marathon bombing, in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez)

  • Investigators continue to search for one of two suspects in the Boston Marathon bombing, in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke)

  • Investigators continue to search for one of two suspects in the Boston Marathon bombing, in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Matt Rourke)

  • Members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter near the home of suspect #2 on Norfolk Street April 19, 2013 in Cambridge, Massachusetts. A Massachusetts Institute of Technology (MIT) campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. One suspect has been killed during the car chase and police are seeking another, believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)

  • Residents are seen near a window, top, as an official wearing tactical gear stands guard while searching for an individual believed to be involved in the Boston Marathon explosions in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during a getaway attempt in a long night of violence that left one of them dead and another still at large Friday, authorities said as the manhunt intensified for a young man described as a dangerous terrorist. (AP Photo/Julio Cortez)

  • Residents and their pets are evacuated as members of the FBI, State Police, Boston Police, Cambridge Police, and other law enforcement agencies, survey the perimeter near the home of suspect #2 on Norfolk Street April 19, 2013 in Cambridge, Massachusetts. A Massachusetts Institute of Technology (MIT) campus police officer was shot and killed late Thursday night at the school's campus in Cambridge. A short time later, police reported exchanging gunfire with alleged carjackers in Watertown, a city near Cambridge. One suspect has been killed during the car chase and police are seeking another, believed to be the same person (known as Suspect Two) wanted in connection with the deadly bombing at the Boston Marathon earlier this week. Police have confirmed that the dead assailant is Suspect One from the recently released marathon bombing photographs. (Photo by Jared Wickerham/Getty Images)

  • Police continue to patrol the neighborhoods of Watertown, Mass. Friday, April 19, 2013, as a massive search continued for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours after an encounter with law enforcement. (AP Photo/Craig Ruttle)

  • Boston Marathon Explosions

    Police presence grows in the neighborhoods of Watertown, Mass., Friday, April 19, 2013, as a massive search involving hundreds of heavily armed law enforcement officials continues for one of two suspects in the Boston Marathon bombing. A second suspect died in the early morning hours in a car chase and gun battle overnight that left one of them dead and his brother on the loose, authorities said Friday. (AP Photo/Craig Ruttle)

  • Boston Marathon Explosions

    Police in tactical gear arrive on an armored police vehicle as they surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa)

  • Boston Marathon Explosions

    Police walk through a neighborhood in Watertown, Mass., while searching for a suspect in the Boston Marathon bombings, Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa)

  • A bus with law enforcement agents travels through Watertown, Mass., Friday, April 19, 2013. All residents of Boston were ordered to stay in their homes Friday morning as the search for the surviving suspect in the marathon bombings continued after a long night of violence that left another suspect dead. (AP Photo/Julio Cortez)

  • Boston Marathon Explosions

    A police officer in tactical gear conducts a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Matt Rourke)

  • Police in tactical gear conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Matt Rourke)

  • Boston Marathon Explosions

    Police in tactical gear conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Matt Rourke)

  • Boston Marathon Explosions

    A Department of Homeland Security officer, right, prepares to enter an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa)

  • Boston Marathon Explosions

    With his weapon drawn, an official inspects an apartment building in Watertown, Mass., Friday, April 19, 2013. Dozens of officers and National Guard members are in Watertown, where gunfire and explosions were heard early Friday morning. (AP Photo/Julio Cortez)

  • Police in tactical gear conduct a search for a suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. All residents of Boston were ordered to stay in their homes Friday morning as the search for the surviving suspect in the marathon bombings continued after a long night of violence that left another suspect dead. (AP Photo/Matt Rourke)

  • Residents look out a window as officials inspect an apartment building in Watertown, Mass., Friday, April 19, 2013. Two suspects in the Boston Marathon bombing killed an MIT police officer, injured a transit officer in a firefight and threw explosive devices at police during their getaway attempt in a long night of violence that left one of them dead and another still at large Friday. (AP Photo/Julio Cortez)

  • Boston Marathon Explosions

    Police in tactical gear arrive on an armored police vehicle as they surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa)

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MAKHACHKALA, Russia (AP) — Russia's volatile North Caucasus, which the two suspects in the Boston Marathon bombings once called home, have seen two decades of brutal fighting between Russian forces and separatists bent on carving out an independent Islamic state.

There was no information on any possible links between the suspects and any insurgent group. Tamerlan Tsarnaev — the 26-year-old killed in a gun battle with police in Massachusetts overnight — and his 19-year-old brother Dzhokhar are ethnic Chechens whose family left Chechnya long ago and moved to Central Asia, according to the Chechen government.

Before moving to the United States a decade ago, their uncle said, the brothers lived briefly in Makhachkala, the capital of Dagestan. Their father lives there now.

The conflict in Chechnya began in 1994 as a separatist war, but quickly morphed into an Islamic insurgency dedicated to forming an Islamic state in the Caucasus. Dagestan has since become the epicenter of the insurgency.

Russian troops withdrew from Chechnya in 1996 after the first Chechen war, leaving it de-facto independent and largely lawless, but then rolled back three years later following apartment building explosions in Moscow and other cities blamed on the rebels.

Russia faced strong international criticism for its indiscriminate use of force against civilians and other rights abuses in Chechnya. The two separatist wars killed an estimated 100,000 people, and Russian bombing reduced most of Chechnya's capital, Grozny, and many other towns and villages to rubble, sending tens of thousands fleeing.

Chechnya has stabilized under the steely grip of Kremlin-backed local strongman Ramzan Kadyrov, a former rebel whose forces have been accused of severe human rights abuses. But the Islamic insurgency has spread to neighboring provinces, with Dagestan — sandwiched between Chechnya and the Caspian Sea — becoming the epicenter of violence. Militants launch daily attacks against police and other authorities.

Militants from Chechnya and neighboring provinces have carried out a long series of terrorist attacks in Russia, including a 2002 raid of a Moscow theater, in which 129 hostages died; a 2004 hostage-taking at a school in the southern city of Beslan that killed more than 330 people, and numerous bombings in Moscow and other cities.

The Obama administration placed Chechen warlord Doku Umarov on a list of terrorist leaders after he claimed responsibility for March 2010 suicide bombings on Moscow's subway that killed 40 people and a November 2009 train bombing that claimed 26 lives.

In recent years, however, militants in Chechnya, Dagestan and neighboring provinces have largely refrained from attacks outside the Caucasus.

Russian officials and experts have claimed that rebels in Chechnya had close links with al-Qaida. They say dozens of fighters from Arab countries trickled into Chechnya during the fighting there, while some Chechen militants have gone to fight in Afghanistan.

The U.S. has long urged Russia's government and separatist elements in Chechnya not aligned with al-Qaida or other terrorist organizations to seek a political settlement.

Washington provided aid to the area during the high points of fighting in the 1990s and in the early 2000s, and has demanded human rights accountability. But the U.S. always backed the territorial integrity of Russia, never endorsing the separatists' desire for an independent state. And it has supported Russia's right to root out terrorism in the region.

Dozens of Chechens have trained in Pakistan's northwest frontier of Waziristan, but most have returned to Russia to fight.

Recently, however, the al-Qaida inspired group Tehrik-e-Taliban Pakistan has made strides at recruiting European fighters for attacks against the West, according to Noman Benotman, a former jihadist fighter who now works for the London-based Quillium Foundation.

The TTP, which has supported attacks in response to U.S. drone strikes, was linked to the failed 2010 attack in New York City's Times Square.

"I would be surprised if these attacks were the work of lone wolves," Benotman said.

In recent years, people from Chechnya have faced charges in several European countries.

In 2011, a Danish court sentenced a Chechen-born man to 12 years in prison for preparing a letter bomb that exploded as he was assembling it in a Copenhagen hotel.

Last month, Spain's Interior Ministry said French and Spanish police arrested three suspected Islamic extremists in an operation in and around Paris. A statement said the suspected activists were of Chechen origin and believed linked to a terror cell dismantled last August in southern Spain.

Last August, a Turk and two Russians of Chechen descent were arrested and jailed in Spain on charges of belonging to an unnamed terror organization and possession of explosives. They have since been released while investigations continue.
___

Isachenkov reported from Moscow. Also contributing to this report were Musa Sadulayev in Grozny, Russia; Bradley Klapper in Washington; Angela Charlton in Paris; Paisley Dodds in London; and Harold Heckle in Madrid.

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The Washington Post has published a long account of investigators' exhaustive efforts to find the Boston Marathon suspects using mountains of video footage and photographs, as well as other leads. An excerpt:

Quickly, the authorities secured a warehouse in Boston’s Seaport district and filled the sprawling space: On half of the vast floor, hundreds of pieces of bloody clothes were laid out to dry so they could be examined for forensic clues or flown to FBI labs at Quantico in Prince William County for testing. In the other half of the room, more than a dozen investigators sifted through hundreds of hours of video, looking for people “doing things that are different from what everybody else is doing,” Boston Police Commissioner Edward Davis said in an interview Saturday. The work was painstaking and mind-numbing: One agent watched the same segment of video 400 times.

Read the whole thing here.

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CBS News reports that Boston bombing suspect captured on Friday night suffered at least two bullet wounds, and that one of them may be evidence that he tried to end his own life.

The bullet wound to the neck, which has an exit wound in the back of the 19-year-old’s neck, “is very possibly a suicide attempt,” said Miller, a former assistant director at the Federal Bureau of Investigation.

Read the whole report here.

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The Daily News reports:

The two men, known to neighbors by their first names Azmat and Diaz — who share a black BMW SUV adorned with a novelty license plate that reads “Terrorista #1” — were cuffed and hauled out of their Carriage Dr. apartment shortly before 4 p.m.

The apparent arrests occurred about 30-45 minutes after authorities with the FBI, ICE and the U.S. Department of Homeland Security descended on the Hidden Brook Apartment complex.

Read more here.

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The Guardian has an account of the dead bombing suspect's 2012 voyage to Dagestan, a small, troubled region of Russia where he had once lived:

According to US travel records, Tsarnaev arrived at Moscow's Sheremetyevo airport on 12 January, returning on 17 July. He spent time in Makhachkala that summer. "It was 40C and he was wearing these American boots," said Larissa Abakarova, who maintains a shop across the street from the home of the parents of Tsarnaev and his brother, Dzhokhar, who was arrested late on Friday. "He was stylish, kind, good-looking. I'm in shock."

Read the whole thing here.

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The Washington Post has a new story that fills in many details of the Tsarnaev brothers' bloody path to Watertown, including their murder of an MIT Cop:

Just after 10:30 p.m. Thursday, the pair walked up to a parked police car at the Massachusetts Institute of Technology, where Sean Collier, a 26-year-old campus officer, was nearing the end of his 3-to-11 p.m. shift.

A security camera would later show two men approaching the car and speaking to the officer. Abruptly, one of the men was seen pulling a gun and shooting Collier multiple times, including once in the head. Some officers concluded that the shooting was an effort to provoke a larger confrontation with police.

“They were looking to start something,” one official said.

Read the whole thing here.

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From the AP:

Ruslan Tsarni says he grew concerned about Tamerlan Tsarnaev (tsahr-NEYE'-ehv) when he told him in a 2009 phone conversation that he had chosen "God's business" over work or school. Tsarni said he then contacted a family friend who told him Tsarnaev had been influenced by a recent convert to Islam.

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A doctor involved in treating the Boston Marathon bombing suspect who died in a gunbattle with police says he had injuries head to toe and all limbs intact when he arrived at the hospital.

Dr. David Schoenfeld said 26-year-old Tamerlan Tsarnaev was unconscious and had so many penetrating wounds when he arrived at Beth Israel Deaconess Medical Center early Friday that it isn't clear which ones killed him, and a medical examiner will have to determine the cause of death.

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The New York Times reports that the decision to release the photos of the marathon bombing suspects to the public was a major turning point in the investigation.

The authorities knew that broadly distributing the images — some captured by ubiquitous surveillance cameras and cellphone snapshots and winnowed down using sophisticated facial-recognition software — would accelerate the digital dragnet, but they did not realize the level of chaos it would create.

Intelligence and law enforcement officials said the authorities in Boston weighed the risks of some mayhem against their growing fear that time was slipping away and that heavily armed and increasingly dangerous men, and possibly accomplices, could wage new attacks in the Boston area or beyond.

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Syracuse University Professor Anthony Rotolo and student Andrew Bauer mapped 200 of the tweets sent out from Boston in the hours right after the marathon bombing, creating an interactive portrait of the city's reaction to Monday's horrifying events.

See the map here.

(h/t Mashable)

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His actions may have been vital in helping police catch the Boston Marathon bombing suspects, even after the attacks both his legs were amputated from the knee down. Now some of that heroism is being returned.

Nearly 10,000 people have now donated to Bucks for Bauman, an effort to help pay the medical expenses of Jeff Bauman, the Boston Marathon bombing survivor known not only for a now iconic -- and extremely graphic -- photo, but also for helping the FBI identify at least one of the bombing suspects. Set up by his friends on the crowdfunding site GoFundMe, the fund has already raised more than $360,000 since last Tuesday to help pay for Bauman’s devastating injuries.

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Massachusetts Gov. Deval Patrick says the surviving suspect in the Boston Marathon bombings is in serious but stable condition and likely can't communicate yet.

Patrick spoke outside Fenway Park after appearing in a pregame ceremony at Saturday afternoon's Red Sox game.

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The American Civil Liberties Union says it's concerned the surviving Boston Marathon bombing suspect will be questioned by investigators without being read his Miranda rights.

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Details of the manhunt for the Boston Marathon bombing suspects were murky at the height of the investigation, leading many news outlets to misreport the facts. But now that both suspects have been apprehended, the specific circumstances of the search that locked down one Boston suburb for nearly 18 hours are becoming more clear.

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Federal public defenders have agreed to represent the suspect in the Boston Marathon bombings.

Miriam Conrad, the federal defender for Massachusetts, says her office expects to represent Dzhokhar Tsarnaev after he is charged.

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boat

How police saw that someone was in the boat without removing the tarp covering it.

Image credit: Massachusetts State Police

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Republican lawmakers issued a statement Saturday urging President Barack Obama to treat Dzhokhar Tsarnaev, the suspect in the Boston Marathon bombings, as an "enemy combatant."

Sens. Lindsey Graham (R-S.C.), John McCain (R-Ariz.) and Kelly Ayotte (R-N.H.) and Rep. Peter King (R-N.Y.) said Tsarnaev "clearly is a good candidate for enemy combatant status" in a statement posted to Graham's website.

"We do not want this suspect to remain silent," the lawmakers said in their statement.

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Wearing special home jerseys with "Boston" sewn across the chest, the Red Sox returned to Fenway Park on Saturday afternoon. More importantly, the people of Boston gathered together to resume their normals lives and root, root, root for the home team just one day after authorities aprehended the second suspect in the Boston Marathon bombings.

The Red Sox game against the Kansas City Royals was preceded by an emotional pre-game ceremony that honored the victims of the horrific attacks on the Boston Marathon and paid tribute to law enforcement officials, first responders, race participants and volunteers. The emotional scene also included a stirring montage of images from the tumultuous week in Boston set to the song "Hallelujah" as performed by Jeff Buckley, ceremonial first pitches and yet another rousing sing-along rendition of the national anthem.

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One of the two ethnic Chechens suspected by U.S. officials of being behind the Boston Marathon bombings had been under FBI surveillance for at least three years, his mother said.

Zubeidat Tsarnaeva told the English-language Russia Today state television station in a phone interview, a recording of which was obtained by Reuters, that she believed her sons were innocent and had been framed.

Tamerlan Tsarnaev, 26, was killed in a shootout with police and his 19-year-old brother Dzhokhar was captured after a day-long manhunt.

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College students in Boston were dancing in the streets Friday night after a week of turmoil.

The fatal bombings at the Boston Marathon on Monday locked down many higher education institutions in the Boston metro area, forcing them to cancel classes.

Just as colleges began to recover from the attack, a Thursday night shooting on the Massachusetts Institute of Technology campus left one officer dead. One of the bombing suspects was killed in a shoot-out with police a short time later, and a subsequent manhunt for remaining bombing suspect Dzhokhar Tsarnaev put schools back on lockdown Friday.

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Handguns, a rifle and at least six bombs -- three of which exploded -- were found at the scene early Friday after officers first confronted the two Boston Marathon bombing suspects in the darkness of a residential street, the Watertown, Massachusetts, police chief told

CNN's Wolf Blitzer on Saturday.

A single officer was the first to encounter the two cars that Tamerlan and Dzhokar Tsarnaev were driving, just before 1 a.m. Friday, Chief

Edward Deveau said.

Read more at CNN

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David Henneberry may not have tried to be a hero, but that's what he's being called.

The Watertown boat owner was the first to spot the bombing suspect Dzhokhar Tsarnaev after the 19-year-old eluded police following a shootout early Friday.

Henneberry tipped off police, leading to the eventual capture of Tsarnaev Friday night.

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President Barack Obama spoke about the "resolve and resilience" of Boston during his weekly address on April 20.

"On Monday, an act of terror wounded dozens and killed three innocent people at the Boston Marathon," Obama says in a video posted to the White House's YouTube page on Saturday. "But in the days since, the world has witnessed one sure and steadfast truth: Americans refuse to be terrorized."

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If you found in your copy of Friday morning's New York Post a letter from the paper's editor-in-chief, Col Allan, expressing "regret" over the Post's "intentionally misleading and harmful" coverage of the Boston bombing, you might have thought, well, that's appropriate, but I didn't see that coming given the fact that Allan wasn't apologetic yesterday, for his paper's astounding failures during this trying week.

Also, you may have gone on to think, this letter is unusually eloquent for a man who essentially has nothing but cheap gin and trash pulled from the East River sloshing around inside his skull.

Well, allow me to penetrate the mystery.

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New York state Sen. Greg Ball (R) suggested using torture on Dzhokhar Tsarnaev, the suspect in the Boston Marathon bombing, in a tweet Friday night.

Tsarnaev was captured by authorities late Friday evening in Watertown, Mass., four days after the Boston Marathon bombing. Authorities say the suspect and his brother, 26-year-old Tamerlan Tsarnaev, killed an MIT police officer, severely wounded another lawman and hurled explosives at police in a car chase and gun battle.

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President Barack Obama Friday night praised law enforcers and Bostonians after the massive manhunt that led to the capture of the second suspect in the Boston Marathon bombings. The first suspect was killed Thursday in a shootout with police.

As he began his address, Obama thanked the public, saying, "Tonight, our nation is in debt to the people of Boston." He went on to thank Bostonians as "citizens and partners" in the investigation.

The president said he had ordered the "full resources of the federal government" to help in the investigation that he said wouldn't have been possible without close coordination among federal, state and local authorities.

"They all worked as they should," Obama said, "as a team."

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HuffPost's Michael McLaughlin and Christina Wilkie report:

WATERTOWN, Mass. -- Friday morning in the Boston area began in a tense silence, as the sprawling manhunt for an alleged teenaged terrorist forced city residents indoors for their own safety. Friday night, however, ended with spontaneous parades celebrating his capture.

As 19-year-old Dzhokhar Tsarnaev was pulled wounded from his backyard boat hideout and raced to Beth Israel Hospital in police custody, many Bostonians finally exhaled, after a devastating week that began with the double bombings at Monday’s Boston marathon. The suspect's brother, Tamerlan Tsarnaev, 26, was killed Friday morning in a shootout with police.

"CAPTURED!!!" trumpeted the Boston Police Department on Twitter Friday night. "The hunt is over. The search is done. The terror is over. And justice has won. Suspect in custody."

Read more here.

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Message from FBI Director Robert S. Mueller:

During this long week, we have seen an extraordinary effort by law enforcement, intelligence, and public safety agencies. These collaborative efforts, with the help and cooperation of the public, resulted in the successful outcome we have seen tonight. The investigation will continue as part of our efforts to seek answers and justice, and there will be no pause in that effort. But tonight, I wish to thank all those who worked so tirelessly throughout the week in the pursuit of safety and justice.

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