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Thick smoke billows into the sky from the area behind the Statue of Liberty where the World Trade Center towers stood, on Tuesday, Sept. 11, 2001. The towers collapsed after terroists crashed two planes into them. (AP Photo, Daniel Hulshizer)

Smoke billows from one of the towers of the World Trade Center and flames and debris explode from the second tower, Tuesday, Sept. 11, 2001. In one of the most horrifying attacks ever against the United States, terrorists crashed two airliners into the World Trade Center that brought down the twin 110-story towers. (AP Photo, Chao Soi Cheong)

A hijacked airliner approaches one of the World Trade Center towers in New York on Sept. 11, 2001. The airliner was flown into the building causing the collapse of the building later in the day. (AP Photo, Carmen Taylor)

People hang out of broken windows of the World Trade Center's north tower in New York on Sept. 11, 2001. (AP Photo, Amy Sancetta)

Smoke billows from the World Trade Center in lower Manhattan area of New York on Wednesday, Sept. 12, 2001. The photograph was taken by a U.S. Geological Survey satellite that flew over the region at about 9:30 a.m. Tuesday, Sept. 11, 2001.(AP Photo, USGS)

Smoke pours from the World Trade Center towers on Sept. 11, 2001 after they were struck by two hijacked airliners. (Gannett News Service, Melissa Klein, The (Westchester, N.Y.) Journal News)

Smoke billows from the World Trade Center in New York as the South tower begins to fall on Sept. 11, 2001, as seen from East Orange, N.J. (Gannett News Service, Tim Dillon, USA Today)

Two women hold each other as they watch the World Trade Center burn following a terrorist attack on the twin towers in New York on Sept. 11, 2001. (AP Photo, Ernesto Mora)

The twin towers of the World Trade Center burn in the background of the Empire State Building in New York on Sept. 11, 2001. (AP Photo, Marty Lederhandler)

Chief of Staff Andy Card whispers to President George W. Bush, giving him word that planes crashed into the World Trade Center in New York on Sept. 11, 2001. Bush was visiting the Emma E. Booker Elementary School in Sarasota, Fla. at the time. (AP Photo, Doug Mills)

The south tower of New York's World Trade Center, left, begins to collapse after a terrorist attack on the buildings on Sept. 11, 2001. Federal investigators believe the second World Trade Center tower fell much more quickly than the first because it faced a more concentrated, intense fire inside, officials said Tuesday. Oct. 19, 2004. (AP Photo, Gulnara Samoilova)

People run from the collapsing World Trade Center tower in New York on Sept. 11, 2001. (AP Photo, Amy Sancetta)

People run from the collapse of the World Trade Center tower in New York on Sept. 11, 2001. (AP Photo, Suzanne Plunkett)

A subway entrance at the intersection of Dey and Church Streets is in shambles following the collapse of the World Trade Center towers in New York on Sept. 11, 2001. Remnants of the towers are in the background. (AP Photo, Mark Lennihan)

People flee the scene near New York's World Trade Center after terrorists crashed two planes into the towers and destroying them on Sept. 11, 2001. (AP Photo, Diane Bondareff)

In this Sept. 11, 2001 photo made by the New York City Police Department and provided by ABC News, Feb. 9, 2010, smoke and ash rise above downtown high-rise buildings, engulfing the lower Manhattan area of New York. The World Trade Center towers were toppled after terrorists flew two hijacked airliners into the buildings. (AP Photo, Det. Greg Semendinger, NYPD, via ABC News)

A firefighter sits on a wrecked fire truck after two airliners crashed into the World Trade Center September 11, 2001. The truck was destroyed when the buildings collapsed. (Gannett News Service, Seth Harrison, The (Westchester, N.Y.) Journal News)

Three New York City firefighters raise the American flag in the rubble of the World Trade Center in New York on Sept. 11, 2001. (Gannett News Service, Ricky Flores, The (Westchester, N.Y.) Journal News)

People flee the area near the collapsed World Trade Center towers in New York on Sept. 11, 2001. (AP Photo, Suzanne Plunkett)

Fire burns at the Pentagon shortly after a hijacked commercial airliner was crashed into the building on Sept. 11, 2001. (Gannett News Service, Daryl Donley)

Military personnel run from the Pentagon after a hijacked plane was crashed into the Arlington, Va. building on Sept. 11, 2001. (Gannett News Service, H. Darr Beiser, USA Today)

An FBI aerial photograph, taken Wednesday, Sept. 12, 2001, shows the crash site of hijacked United Airlines Flight 93 in Shanksville, Pa. The Boeing 757 was headed from Newark, N.J., to San Francisco when it made an abrupt turn near Cleveland and veered back east across Pennsylvania before crashing in Shanksville, killing all 44 aboard. (AP Photo, FBI)

New York Gov. George Pataki, from left, New York City Mayor Rudolph Giuliani, center, and Sen. Hillary Rodham Clinton, D-N.Y., tour the site of the World Trade Center disaster on Sept. 12, 2001. (AP Photo, Robert F. Bukaty)

White Plains, N.Y. firefighters pull back due to the threat of collapse while aiding in the rescue efforts at the World Trade Center in New York on Wednesday, Sept. 12, 2001. (Gannett News Service, Stuart Bayer, The (Westchester, N.Y.) Journal News)

Rescue workers make their way through the twisted remains of the World Trade Center in New York on Thursday, Sept. 13, 2001. (Gannett News Service, Stephen Schmitt, The (Westchester, N.Y.) Journal News)

Rescue workers make their way through the twisted remains of the World Trade Center in New York, Thursday, Sept. 13, 2001. (Gannett News Service, Stephen Schmitt, The (Westchester, N.Y.) Journal News)

Rescuers look out from the rubble of the World Trade Center on Thursday, Sept. 13, 2001. (Gannett News Service, Jay Capers, The (Westchester, N.Y.) Journal News)

FBI agents, firefighters, rescue workers and engineers work at the Pentagon crash site, Sept. 14, 2001, in Arlington, Va. (Gannett News Service, Tech. Sgt. Cedric H. Rudisill, Department of Defense)

The remains, photographed Sept. 15, 2001, of the World Trade Center in New York has become known as Ground Zero, after two hijacked airliners crashed into the twin towers on Sept. 11. (Gannett, Todd Plitt, USA TODAY)

Martha Morocho, a native of Equador, was widowed when her husband Leonel, 36, was killed in the World Trade Center collapse. He worked as a sous chef for Windows on The World in north tower of the Trade Center complex. The Morochos lost three more members of their extended family in the collapse. These are two of the "missing" posters for Blanca and Leonel Morocho and Moises Rivas that were posted throughout the city. (Gannett, Todd Plitt, USA TODAY)

Maria Urgese holds a photo of her missing nephew Rocco "Nino" Gargano before a memorial service at New York's Central Park on Monday, Oct. 1, 2001, for Cantor Fitzgerald employees who died in the Sept. 11 terrorist attacks on the World Trade Center. Gargano was at his job in the World Trade Center when two hijacked airliners crashed into both towers. Gargano's mother, Antonia Gargano, walks with a family friend at left. (AP Photo, Tina Fineberg)

An American flag hangs near the destoyed portion of the Pentagon on Oct. 5, 2001. The damage was caused by a hijacked airplane during the Sept. 11 terrorist attacks. (Gannett News Service, Frank S. Folwell, USA Today)

Workers continue demolition in October 2001 of the destroyed portion of the Pentagon damaged in the Sept. 11, terrorist attack. (Gannett News Service, Tim Dillon, USA Today)

New City, N.Y., firefighters bow their heads in prayer during a memorial service, Sunday, Oct. 28, 2001, at the site of the World Trade Center in New York. (Gannett News Service, Seth Harrison, The Journal News)

Jodi Waizer, 10, hugs her father Harry Waizer during a visit to The Burke Rehabilitation Hospital in White Plains, N.Y., as her sister Katie, 13, walks into the room. Harry was burned in the attack on The World Trade Center on Sept. 11, 2001. (Gannett News Service, Stephen Schmitt, The (Westchester, N.Y.) Journal News)

Cranes are used in November 2001 to help tear down the parts of the Pentagon destroyed when a hijacked plane crashed into the building on Sept. 11. The demolition and reconstruction of the Pentagon is being done on a twenty-four hour per day schedule. (Gannett, Michael A. Schwarz, USA TODAY)

Judy Custer of Hollsopple, Pa., signs her name, in November 2001, at a memorial site for the victims of hijacked United flight 93 which crashed just outside of Shanksville, Pa., Sept. 11. The memorial is located near the crash site. (Gannett News Service, Eileen Blass, USA Today)

Two beams of light reach into the sky above New York, Monday evening, March 11, 2002, as a temporary memorial to victims of the Sept. 11, 2001 terrorist attacks. (Gannett News Service, Frank Becerra Jr., The (Westchester, N.Y.) Journal News)

The final piece of limestone for the exterior repair of the Pentagon rests on June 11, 2002, in front of the space where it will be placed. This piece was recovered from the charred wreckage of the Sept. 11, 2001 terrorist attack and inscribed with that date. (Gannett News Service/Department of Defense)

Angels represent each passenger of United Flight 93 who died when it crashed in Shanksville, Pa., Sept. 11, 2001 at this temporary memorial on Aug. 27, 2002. (Gannett News Service, Heather Wines)

Caroline Wise, 14, left, hugs Amanda Barshowski, 14, at the temporary memorial to United flight 93 before a cermony, in Shanksville, Pa. on Sept. 11, 2002. The girls, raised $16,100 for the Todd M. Beamer Foundation. Beamer was a passenger on that plane. (Gannett News Service, Michael Schwarz, USA TODAY)

A Sept. 11, 2002 ceremony at the World Trade Center site in New York, marks one-year since the terror attacks in the United States. (Gannett News Service, Robert F. Rodriguez, The (Westchester, N.Y.) Journal News)

The New York skyline rises surrounds Ground Zero early Sept. 11, 2003. (Gannett News Service, Matthew Brown, The (Westchester, N.Y.) Journal News)

The sun sets beyond the Pentagon Memorial on Sept. 4, 2008. It opened to the public on Sept. 11, 2008. It honors the 184 lives lost at the site when a hijacked airliner was crashed into the building. (Gannett, Joe Brier, USA TODAY)

The World Trade Center site, center, is under construction Monday, Sept. 8, 2008 in New York. (AP Photo, Mark Lennihan)

A memorial flag is illuminated on Sept. 11, 2007, near the spot where American Airlines Flight 77 crashed into the Pentagon on Sept. 11, 2001. (Gannett, Brandan W. Schulze, U.S. Navy)

The Tribute in Light marks the Sept. 11, 2007 anniversary of the terrorists attacks in 2001. The Statue of Liberty is in the foreground as photographed from Bayonne, N.J. (AP Photo, Tim Larsen)