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Boston Marathon Bombs Made From Pressure Cookers (PHOTOS, VIDEO, LIVE UPDATES)

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BOSTON -- The two bombs that ripped through the crowds at the Boston Marathon, killing three people and wounding more than 170, were fashioned out of pressure cookers and packed with shards of metal, nails and ball bearings, a person briefed on the investigation said Tuesday.

The details on the apparently crude but deadly explosives emerged as investigators appealed to the public for amateur video and photos that might yield clues, and the chief FBI agent in Boston vowed "we will go to the ends of the Earth"to find those responsible.

A person who spoke on the condition of anonymity because the investigation was still going on said that the explosives were put in 6-litre pressure cookers, placed in black duffel bags and left on the ground. They were packed with shrapnel to inflict maximum carnage, the person said.

The person said law enforcement officials have some of the bomb components but do not yet know what was used to set off the explosives.

A doctor treating the wounded appeared to corroborate the person's account, saying one of the victims was maimed by what looked like ball bearings or BBs. Doctors also said they removed a host of sharp objects from the victims, including nails that were sticking out of one little girl's body.

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WARNING: Some of the photos and videos from the scene may be graphic and disturbing. Story continues after slideshow

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At the White House, meanwhile, President Barack Obama said that the bombings were an act of terrorism but that investigators do not know if they were carried out by an international organization, domestic group or a "malevolent individual.''

He added: "The American people refuse to be terrorized.''

Across the U.S., from Washington to Los Angeles, police tightened security, monitoring landmarks, government buildings, transit hubs and sporting events. Security was especially tight in Boston, with bomb-sniffing dogs checking Amtrak passengers' luggage at South Station and transit police patrolling with rifles.

"They can give me a cavity search right now and I'd be perfectly happy,"said Daniel Wood, a video producer from New York City who was waiting for a train.

Similar pressure-cooker explosives have been used in Afghanistan, India, Nepal and Pakistan, according to a July 2010 joint FBI and Homeland Security intelligence report. Also, one of the three devices used in the May 2010 Times Square attempted bombing was a pressure cooker, the intelligence report said.

"Placed carefully, such devices provide little or no indication of an impending attack,"the report said.

The Pakistani Taliban, which claimed responsibility for the 2010 attempt in Times Square, has denied any role in the Boston Marathon attack.

The two bombs blew up about 10 seconds and around 100 yards apart Monday near the finish line of the storied, 26.2-mile race, tearing off limbs, knocking people off their feet and leaving the streets spattered with blood and strewn with broken glass. The dead included an 8-year-old boy.

"We started grabbing tourniquets and started tying legs. A lot of people amputated,"said Roupen Bastajian, a state trooper from Smithfield, R.I., who had just finished the race when he heard the explosions.

Federal investigators said no one had claimed responsibility for the bombings, which took place on one of the city's biggest civic holidays, Patriots Day.

"We will go to the ends of the Earth to identify the subject or subjects who are responsible for this despicable crime, and we will do everything we can to bring them to justice,"said Richard DesLauriers, FBI agent in charge in Boston.

He said investigators had received "voluminous tips"and were interviewing witnesses and analyzing the crime scene.

Gov. Deval Patrick said that contrary to earlier reports, no unexploded bombs were found. He said the only explosives were the ones that went off.

FBI agents searched an apartment in the Boston suburb of Revere overnight, and investigators were seen leaving with brown paper bags, plastic trash bags and a duffel bag. But it was unclear whether the tenant had anything to do with the attack.

A law enforcement official who spoke on condition of anonymity because he was not authorized to release details of the investigation said the man had been tackled by a bystander, then police, as he ran from the scene of the explosions.

But he said it is possible the man was simply running away to protect himself from the blast, as many others did.

At a news conference, police and federal agents repeatedly appealed for any video, audio and photos taken by marathon spectators, even images that people might not think are significant.

"There has to be hundreds, if not thousands, of photos and videos"that might help investigators, state police Col. Timothy Alben said.

Boston Police Commissioner Edward Davis said investigators also gathered a large number of surveillance tapes from businesses in the area and intend to go through the video frame by frame.

"This is probably one of the most photographed areas in the country yesterday,"he said.

At least 17 people were critically injured, police said. At least eight children were being treated at hospitals. In addition to losing limbs, victims suffered broken bones, shrapnel wounds and ruptured eardrums.

Dr. Stephen Epstein of the emergency medicine department at Beth Israel Deaconess Medical Center said he saw an X-ray of one victim's leg that had "what appears to be small, uniform, round objects throughout it -- similar in the appearance to BBs.''

Eight-year-old Martin Richard was among the dead, said U.S. Rep. Stephen Lynch, a family friend. The boy's mother, Denise, and 6-year-old sister, Jane, were badly injured. His brother and father were also watching the race but were not hurt.

A candle burned on the stoop of the family's single-family home in the city's Dorchester section Tuesday, and the word "Peace"was written in chalk on the front walk.

Neighbour Betty Delorey said Martin loved to climb the neighbourhood trees, and hop the fence outside his home.

The Boston Marathon is one of the world's oldest and most prestigious races and about 23,000 runners participated. Most of them had crossed the finish line by the time the bombs exploded, but thousands more were still completing the course.

The attack may have been timed for maximum bloodshed: The four-hour mark is typically a crowded time near the finish line because of the slow-but-steady recreational runners completing the race and because of all the friends and relatives clustered around to cheer them on.

Davis, the police commissioner, said authorities had received "no specific intelligence that anything was going to happen"at the race. On Tuesday, he said that two security sweeps of the route had been conducted before the marathon.

The race winds up near Copley Square, not far from the landmark Prudential Center and the Boston Public Library. It is held on Patriots Day, which commemorates the first battles of the American Revolution, at Concord and Lexington in 1775.

Richard Barrett, the former U.N. co-ordinator for an al-Qaida and Taliban monitoring team who has also worked for British intelligence, said the relatively small size of the devices in Boston and the timing of the blasts suggest a domestic attack rather than an al-Qaida-inspired one.

"This happened on Patriots Day -- it is also the day Americans are supposed to have their taxes in -- and Boston is quite a symbolic city,"said Barrett, now senior director at the Qatar International Academy for Security Studies.

Eileen Sullivan contributed to this story from Washington. Associated Press writers Jay Lindsay, Denise Lavoie, Steve LeBlanc, Bridget Murphy, Rodrique Ngowi and Meghan Barr in Boston; Julie Pace and Lara Jakes in Washington; Paisley Dodds in London and Marilynn Marchione in Milwaukee also contributed.

One marathon suspect has been captured, according to an official with knowledge of the investigation.

Another remains on the loose in Watertown after a firefight with police. Authorities have established a 20-block perimeter as they search for him.

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new photo suspect 2

Just hours after the FBI released the first photos of suspects in the Boston Marathon bombing, a new photo of Suspect 2 may have emerged.

David Green, 49, of Jacksonville, Fla., had just completed his first Boston Marathon, when he snapped a picture with his iPhone 4S, taken at 2:50, just after the two blasts ripped through the finish line area, killing three people and injuring more than 180 others.

The FBI has not publicly confirmed this photo as Suspect 2, but Green told the Huffington Post that an agent told him, "this is probably the best we have right now."

The man who appears to be Suspect 2 is wearing a white hat with a "3" on the side as seen in the publicly-released photos.

Read more here.

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Minutes before the bombs blew up in Boston, Jeff Bauman looked into the eyes of the man who tried to kill him.

Just before 3 p.m. on April 15, Bauman was waiting among the crowd for his girlfriend to cross the finish line at the Boston Marathon. A man wearing a cap, sunglasses and a black jacket over a hooded sweatshirt looked at Jeff, 27, and dropped a bag at his feet, his brother, Chris Bauman, said in an interview.

Read more here.

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info wars

BOSTON -- Moments after the FBI revealed images of two baseball cap-wearing men wanted for questioning about the Boston bombings, the press conference descended into a sideshow.

A journalist from a far-right wing website called Info Wars shouted out a question accusing the government of carrying out the attack that killed three, and maimed or injured 170 others.

FBI Special Agent in Charge Richard Deslauriers ignored the allegation of a government conspiracy from reporter Daniel Bidondi, but the Alex Jones protege did not stop hollering.

"The FBI lies," Bidondi said. "We've got the proof," he said accusing the government of a "false flag" attack in which it staged the blasts and made them appear like the work of terrorists.

Bidondi found himself at the center of an media scrum with cameras and microphones pointed at his face after law enforcement officials left the podium in the Sheraton hotel.

Another reporter ridiculed Bidondi from across the room, telling him to shut up and calling him an asshole.

The excitement quickly dissipated as reporters returned to delivering the news about the official images of the suspects.

Bidondi has been a presence at other press conferences this week related to the bombing investigation.

--Michael McLaughlin / HuffPost Crime

CORRECTION: An earlier version of this story misspelled Bidondi's last name. We regret the error.

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Dr. Ralph Gross, a facial recognition expert at Carnegie Mellon University, said the FBI photos of two suspects in the Boston Marathon bombing are likely too grainy to be matched against a driver's license database or Facebook. But he thinks they may be just good enough for someone who knows the individuals to identify them.

"The resolution isn't particularly good. The one that's kind of best is unfortunately a side view -- and in general the face recognition software works best with frontal view," he said.

Research has consistently found, however, that people can spot people they know even in grainy, off-center photographs.

"Humans are actually very good at recognizing people that they are familiar with," Gross said. "Somebody that might know these guys, or might know the way they dress, might certainly be able to recognize them."

The FBI said the men should be considered armed and dangerous, and urged tipsters to call 1-800-CALL-FBI if they believe they have information that could lead to an arrest.

--Matt Sledge

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The New York Daily News reportedly doctored its front page photograph of the Boston bombings (see update below).

WARNING: LINK GOES TO GRAPHIC PHOTO

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suspects

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CNN reports that, because of a flood of traffic, the FBI's site is temporarily down.

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FBI's Richard Richard DesLauriers said the only official photos that should be relied upon in the investigation are the pictures the FBI unveiled.

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Richard DesLauriers "somebody out there knows these individuals". They are considered armed and extremely dangerous.

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The FBI's Richard Richard DesLauriers unveils photos of two suspects.

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The press conference is scheduled for 5 p.m. Watch it here.

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From The Huffington Post's Michael McLaughlin ...

Christine Anastos and her therapy dog Windy comforted runners who dropped in to the Boston Athletic Association's offices today.

Windy, a black labrador who retired from Guiding Eyes for the Blind, was a big hit with the Marathoners.

"I don't think there was a moment when someone wasn't petting her," she said about Windy,who was joined by a Newfoundland and boxer. "All she has to do is be herself. She's so sensitive. She takes in all the emotion."

Anastos makes Windy available through Therapy Dogs International There are more than 100 therapy dogs available within a 20 mile radius of Boston, she said, so people should contact the group if they're interested.

boston dog christine anastos and windy

Christine Anastos and Windy

boston dog windy

WIndy

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The New York Post once again found itself in trouble after it published front-page photos of two men on Thursday who it said were being searched for in connection with the Boston bombings. The problem? They were completely innocent.

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The FBI press conference scheduled for 5 p.m. today is the first public briefing in two days, according to Fox News.

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boston

BOSTON, MA - APRIL 18: Boston Mayor Thomas Menino pauses after speaking at an interfaith prayer service for victims of the Boston Marathon attack titled 'Healing Our City,' at the Cathedral of the Holy Cross on April 18, 2013 in Boston, Massachusetts. Authorities investigating the attack on the Boston Marathon have shifted their focus to locating the person who placed a black bag down and walked away just before the bombs went off. The twin bombings at the 116-year-old Boston race, which occurred near the marathon finish line, resulted in the deaths of three people and more than 170 others injured. (Photo by Spencer Platt/Getty Images)

boston

US President Barack Obama speaks during the 'Healing Our City: An Interfaith Service' dedicated to those who were gravely wounded or killed in the Boston Marathon bombing, at the Cathedral of the Holy Cross in Boston, Massachusetts, on April 18, 2013. Obama is in Boston to mourn victims of the deadly marathon attacks, as investigators study images of a suspect who may have planted the bombs. No arrests have been made in connection with Monday's twin bombings near the finish line of the race, which sent metal fragments and nails into a crowd of thousands of runners and spectators, killing three people and wounding 180. AFP PHOTO/Jewel Samad

boston

BOSTON, MA - APRIL 18: Former Massachusetts Governor and 2012 Republican presidential nominee Mitt Romney attends an interfaith prayer service for victims of the Boston Marathon attack titled 'Healing Our City,' where President Barack Obama spoke at the Cathedral of the Holy Cross on April 18, 2013 in Boston, Massachusetts. Authorities investigating the attack on the Boston Marathon have shifted their focus to locating the person who placed a black bag down and walked away just before the bombs went off. The twin bombings at the 116-year-old Boston race, which occurred near the marathon finish line, resulted in the deaths of three people and more than 170 others injured. (Photo by Spencer Platt/Getty Images)

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A local paper in Minnesota ran an unfortunately placed ad for a pressure cooker -- right next to a story about the Boston Marathon bombing, which was likely carried out using pressure cookers packed with shrapnel and explosives.

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From the AP:

BOSTON -- Kenneth Feinberg, an attorney who managed the 9/11 Victim Compensation Fund, will design and administrator of a new fund to help people affected by the Boston Marathon bombing.

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Boston Marathon Fund raises more than million in 24 hours.

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From The Huffington Post's Michael McLaughlin ...

BOSTON -- The sight of bright blue and yellow windbreakers and t-shirts have become an instant symbol of Boston's healing and unity since Monday's double bombing.

The flashy colors are worn mainly as the official gear of the marathon. Blue is for the 23,000 runners and yellow is for the thousands of volunteers. Adidas also produces versions of the merchandise that's available to the paying public.

"This is my sport. This is my city," said Kim Stemple, a race volunteer wearing a lemon yellow jacket available on Thursday

"We know each other. We're each other's best therapy," she said about other volunteers.

Griffin Schroeder donned the blue runners' jacket as he stood near a memorial on Boylston Street before heading back to Wisconsin.

"It's out of respect," the 27-year-old said, adding that it's a symbol of completely the grueling event. "It's a very important accomplishment."

The windbreaker is an open invitation to talk with other marathoners. "I might ask someone if they finished the race. Or if I see someone we give a nod to each other."

Volunteer Susan Furgal of Brockton, Mass wept Thursday as she wore hers near the bomb site.

"I had to make myself come back," she told HuffPost.

Others find simple comfort in displaying that they were a part of the marathon.

"I just feel good wearing it," said Lene Henricksen, 51, from Denmark who was interrupted by the attack before finishing the 26.2 mile course. "This should never happen again. The marathon should go on."

boston marathon

Griffin Schoder wears the blue runner's jacket "out of respect" for the attack, but also because he's proud to have completed the testing race.

boston marathon runners pat cohen and kim stemple

Race volunteers Pat Cohen and Kim Semple embrace near the makeshift memorial of flowers and candles on Boylston Street

boston marathon runners lene henricksen

The race was called off before Henricksen, of Denmark, got to the finish line. She had the misfortune of traveling to New York for last fall's marathon that was canceled due to Hurricane Sandy.

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From The Huffington Post's Christina Wilkie: Relatives of bomb victims who remained in the Intensive Care Unit of Massachusetts General Hospital in Boston on Thursday were unable to watch President Obama's tribute to those killed and injured in the blast, but they were nonetheless very keen to know what the president said. One family member of a renect amputee sent a text to HuffPost during the speech that said, "ICU has no TV's! How is it?" By all accounts, it was a very good speech.

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"This time next year on the third Monday in April the world will return to this city to run even harder."

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