NEW YORK -- A 16-year-old boy bypassed security and climbed to the top of 1 World Trade Center, the nation's tallest building, to take pictures in the middle of the night, police said Thursday.

The teen was arrested at 6 a.m. Sunday and charged with misdemeanour criminal trespass, said Joe Pentangelo, a spokesman for the Port Authority of New York and New Jersey, which owns the trade centre site.

The teen got on the construction site of the nearly completed tower through a 1-foot opening in a fence, Pentangelo said. He then allegedly entered the tower by climbing scaffolding.

The teen eluded a guard on the 104th floor; the guard has since been fired, the spokesman said.

It was not immediately known how the teen got to the 104th floor without being noticed.

Port Authority police arrested him on the premises. His camera and cellphone were seized after authorities obtained a search warrant.

The investigation was continuing into whether the teen may have entered other parts of the building.

"We take security and these types of infractions very seriously and will prosecute violators,'' Joe Dunne, chief security officer for the Port Authority, said in a statement. "We continue to reassess our security posture at the site and are constantly working to make this site as secure as possible.''

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  • Port Authority Offers Media Tour Of One World Trade Observatory On 100th Floor

    NEW YORK, NY - APRIL 02: Manhattan is seen from One World Observatory from the 100th floor of One World Trade Center at the Ground Zero site on April 2, 2013 in New York City. One World Observatory, which is situated more than 1,250 feet over lower Manhattan, will open to the public in 2015 and will include a pre-show theater, multiple spaces that allow for panoramas of the New York City region and numerous dining options. When completed, One World Trade Center will be the tallest building in the Western Hemisphere at 1776 feet. (Photo by Spencer Platt/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    People look at the view as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • David Checketts

    Legends Chairman & CEO David Checketts, at podium center, of the company that will run the observation deck on the 100th floor of the One World Trade Center building, address a news conference in the venue, in New York, Tuesday, April 2, 2013. The observation deck, that will not open until 2015, will occupy the tower's 100th through 102nd floors. Elevators will whisk visitors to the top in just one minute but the experience of visiting the attraction will take an hour. (AP Photo/Richard Drew)

  • David Samson

    Port Authority Chairman David Samson, at podium center left, addresses a news conference in observation deck on the 100th floor of the One World Trade Center building, under construction in New York, Tuesday, April 2, 2013. The observation deck will occupy the tower's 100th through 102nd floors. Elevators will whisk visitors to the top in just one minute but the experience of visiting the attraction will take an hour. (AP Photo/Richard Drew)

  • Members of the media tour the unfinished observation deck on the 100th floor of the One World Trade Center building, under construction in New York, Tuesday, April 2, 2013. The observation deck will occupy the tower's 100th through 102nd floors. Elevators will whisk visitors to the top in just one minute but the experience of visiting the attraction will take an hour. (AP Photo/Richard Drew)

  • A member of the media takes a photograph of the Manhattan skyline from the unfinished observation deck on the 100th floor of the One World Trade Center building, under construction in New York, Tuesday, April 2, 2013. The observation deck will occupy the tower's 100th through 102nd floors. Elevators will whisk visitors to the top in just one minute but the experience of visiting the attraction will take an hour. (AP Photo/Richard Drew)

  • Members of the media tour the unfinished observation deck on the 100th floor of the One World Trade Center building, under construction in New York, Tuesday, April 2, 2013. The observation deck will occupy the tower's 100th through 102nd floors. Elevators will whisk visitors to the top in just one minute but the experience of visiting the attraction will take an hour. (AP Photo/Richard Drew)

  • A Port Authority worker cleans a window of the unfinished observation deck on the 100th floor of the One World Trade Center building, under construction in New York, Tuesday, April 2, 2013. The observation deck will occupy the tower's 100th through 102nd floors. Elevators will whisk visitors to the top in just one minute but the experience of visiting the attraction will take an hour. (AP Photo/Richard Drew)

  • US-ATTACKS-WTC-PREVIEW

    People look at the view as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    People photograph the view as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    People photograph the view as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    Dave Checketts (front, L), Chairman and CEO of Legends, along with officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    Dave Checketts (front, L), Chairman and CEO of Legends, along with officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    People photograph the view as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. An artists' version of the Observatory is seen on a video screen (R).AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    Officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    Officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    Television crews photograph the view as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    People look at the view as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • Port Authority Offers Media Tour Of One World Trade Observatory On 100th Floor

    NEW YORK, NY - APRIL 02: The Manhattan Bridge is seen from the One World Observatory from the 100th floor of One World Trade Center at the Ground Zero site on April 2, 2013 in New York City. One World Observatory, which is situated more than 1,250 feet over lower Manhattan, will open to the public in 2015 and will include a pre-show theater, multiple spaces that allow for panoramas of the New York City region and numerous dining options. When completed, One World Trade Center will be the tallest building in the Western Hemisphere at 1776 feet. (Photo by Spencer Platt/Getty Images)

  • Port Authority Offers Media Tour Of One World Trade Observatory On 100th Floor

    NEW YORK, NY - APRIL 02: Visitors stand near the windows of the One World Observatory from the 100th floor of One World Trade Center at the Ground Zero site on April 2, 2013 in New York City. One World Observatory, which is situated more than 1,250 feet over lower Manhattan, will open to the public in 2015 and will include a pre-show theater, multiple spaces that allow for panoramas of the New York City region and numerous dining options. When completed, One World Trade Center will be the tallest building in the Western Hemisphere at 1776 feet. (Photo by Spencer Platt/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    A view of One World Trade Center (R) as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    A view of Manhattan looking north as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    A tug boat passes under the Brooklyn Bridge as seen from One World Trade Center as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    A view of One World Trade Center as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • Port Authority Offers Media Tour Of One World Trade Observatory On 100th Floor

    NEW YORK, NY - APRIL 02: Members of the Port Authority Police stand near the windows in the One World Observatory from the 100th floor of One World Trade Center at the Ground Zero site on April 2, 2013 in New York City. One World Observatory, which is situated more than 1,250 feet over lower Manhattan, will open to the public in 2015 and will include a pre-show theater, multiple spaces that allow for panoramas of the New York City region and numerous dining options. When completed, One World Trade Center will be the tallest building in the Western Hemisphere at 1776 feet. (Photo by Spencer Platt/Getty Images)

  • Port Authority Offers Media Tour Of One World Trade Observatory On 100th Floor

    NEW YORK, NY - APRIL 02: Pedestrians cross the street in lower Manhattan as seen from One World Observatory from the 100th floor of One World Trade Center at the Ground Zero site on April 2, 2013 in New York City. One World Observatory, which is situated more than 1,250 feet over lower Manhattan, will open to the public in 2015 and will include a pre-show theater, multiple spaces that allow for panoramas of the New York City region and numerous dining options. When completed, One World Trade Center will be the tallest building in the Western Hemisphere at 1776 feet. (Photo by Spencer Platt/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    A view of Manhattan looking north as officials from the Durst Organization, Legends Hospitality LLC., and the Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • Port Authority Offers Media Tour Of One World Trade Observatory On 100th Floor

    NEW YORK, NY - APRIL 02: Visitors stand near the windows of the One World Observatory from the 100th floor of One World Trade Center at the Ground Zero site on April 2, 2013 in New York City. One World Observatory, which is situated more than 1,250 feet over lower Manhattan, will open to the public in 2015 and will include a pre-show theater, multiple spaces that allow for panoramas of the New York City region and numerous dining options. When completed, One World Trade Center will be the tallest building in the Western Hemisphere at 1776 feet. (Photo by Spencer Platt/Getty Images)

  • Port Authority Offers Media Tour Of One World Trade Observatory On 100th Floor

    NEW YORK, NY - APRIL 02: Visitors stand near the windows of the One World Observatory from the 100th floor of One World Trade Center at the Ground Zero site on April 2, 2013 in New York City. One World Observatory, which is situated more than 1,250 feet over lower Manhattan, will open to the public in 2015 and will include a pre-show theater, multiple spaces that allow for panoramas of the New York City region and numerous dining options. When completed, One World Trade Center will be the tallest building in the Western Hemisphere at 1776 feet. (Photo by Spencer Platt/Getty Images)