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In this Sept. 11, 2001 file photo, a jet airliner is lined up on one of the World Trade Center towers in New York. (AP Photo/Carmen Taylor, File) ( Bin Laden )

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. (AP Photo/Chao Soi Cheong) ( September 11th Terrorist Attacks )

A fireball erupts from one of the World Trade Center towers as it is struck by the second of two airplanes in New York, Tuesday, Sept. 11, 2001. (AP Photo/Todd Hollis) ( September 11th Terrorist Attacks )

Hijacked United Airlines Flight 175 from Boston crashes into the south tower of the World Trade Center and explodes at 9:03 a.m. on September 11, 2001 in New York City. (Photo by Spencer Platt/Getty Images) ( 2149256SP001_wtcblast )

Debris fall from one of the burning twin towers of the World Trade Center after a hijacked plane crashed into the tower on September 11, 2001 in New York City.(AP Photo/Richard Drew) ( Attacks World Trade Center )

A ball of fire explodes from one of the towers at the World Trade Center in New York after a plane crashed into it in this image made from television Tuesday Sept. 11, 2001. The aircraft was the second to fly into the tower Tuesday morning. (AP Photo/ABC via APTN) ( SEPT 11 2001 NYC )

As seen from the New Jersey Turnpike near Kearny, N.J., smoke billows from the twin towers of the World Trade Center in New York after airplanes crashed into both towers Tuesday, Sept.11, 2001. (AP Photo/Gene Boyars) ( SEPT 11 2001 NYC )

Fire and smoke billows from the north tower of New York's World Trade Center Tuesday Sept. 11, 2001 after terrorists crashed two hijacked airliners into the World Trade Center and brought down the twin 110-story towers. (AP Photo/David Karp) ( September 11th Terrorist Attacks )

Debris fall from one of the burning twin towers of the World Trade Center after a hijacked plane crashed into the tower on September 11, 2001 in New York City.(AP Photo/Richard Drew) ( Attacks World Trade Center )

CRIME TERRORISM WORLD TRADE CENTER TWIN TOWERS BURNING TERRORIST ATTACK BLACK SMOKE EMPIRE STATE BUILDING SKYLINE SKYSCRAPERS OVERALL GENERAL VIEW ( September 11th Terrorist Attacks )

Smoke billows from the twin towers of the World Trade Center in New York Tuesday Sept. 11, 2001. (AP Photo/Gulnara Samoilova) ( September 11th Terrorist Attacks )

People hang from the windows of the North Tower of the World Trade Center after a hijacked airliner hit the building September 11, 2001 in New York City. (Photo by Jose Jimenez/Primera Hora/Getty Images) ( 394263_07_blast )

This Sept. 11, 2001 file photo shows the twin towers of the World Trade Center burning behind the Empire State Building in New York. (AP Photo/Marty Lederhandler, FILE) ( Sept 11 Books )

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. Investigators have singled out this Associated Press photograph that they said may provide evidence to support their theory which shows a "kink" in the building's corner at the 106th floor. (AP Photo/Gulnara Samoilova, FILE) ( TRADE CENTER COLLAPSE )

People run from the collapse of World Trade Center Tower Tuesday, Sept. 11, 2001 in New York. (AP Photo/Suzanne Plunkett) ( SEPT 11 2001 NYC )

A person falls from the north tower of New York's World Trade Center in this Sept. 11, 2001 file photo, after terrorists crashed two hijacked airliners into the World Trade Center and brought down the twin 110-story towers. (AP Photo/Richard Drew, File ( Photos Of The Decade Sept. 11 )

President Bush's Chief of Staff Andy Card whispers into the ear of the President to give him word of the plane crashes into the World Trade Center, during a visit to the Emma E. Booker Elementary School in Sarasota, Fla., Tuesday, Sept. 11, 2001. (AP Photo/Doug Mills) ( September 11th Terrorist Attacks )

The south tower of New York's World Trade Center collapses Tuesday Sept. 11, 2001. (AP Photo/Richard Drew) ( September 11th Terrorist Attacks )

A man cries on September 11, 2001 after witnessing the collapse of the north tower of the World Trade Center in New York City.(AP Photo/Shawn Baldwin) ( Attacks World Trade Center )

People run from the collapse of World Trade Center Tower Tuesday, Sept. 11, 2001 in New York. Charlie Ross is seen fourth from the left. (AP Photo/Suzanne Plunkett) ( September 11th Terrorist Attacks )

A firefighter breaks down after the World Trade Center buildings collapsed September 11, 2001 after two hijacked airplanes slammed into the twin towers in a terrorist attack. (Photo by Mario Tama/Getty Images) ( 394261_75_attack )

Survivors of the World Trade Center terrorist attacks make their way through smoke, dust and debris on Fulton St., about a block from the collapsed towers, Tuesday, Sept. 11, 2001 in New York. (AP Photo/Gulnara Samoilova) ( September 11th Terrorist Attacks )

Emergency workers help a women after she was injured in the terrorist attack on the World Trade Center in New York, Tuesday, Sept. 11, 2001. (AP Photo/Gulnara Samoilova) ( September 11th Terrorist Attacks )

People walk in the street in the area where the World Trade Center buildings collapsed September 11, 2001 after two airplanes slammed into the twin towers in a suspected terrorist attack. (Photo by Mario Tama/Getty Images) ( 394261111att_20010919_00115.jpg )

Julie McDermott, center, walks with other victims as they make their way amid debris near the World Trade Center in New York Tuesday Sept. 11, 2001. (AP Photo/Gulnara Samoilova) ( September 11th Terrorist Attacks )

This 11 September 2001 file photo shows Marcy Borders covered in dust as she takes refuge in an office building after one of the World Trade Center towers collapsed in New York. Borders was caught outside on the street as the cloud of smoke and dust enveloped the area. AFP PHOTO/Stan HONDA ( APW2001091109637.jpg )

An ambulance, covered with debris, is on fire after the collapse of the first World Trade Center Tower 11 September, 2001 in New York. AFP PHOTO Doug KANTER /AFP/Getty Images ( APW2001091109696 )

A fireman screams in pain during his rescue shortly after both towers of New York's World Trade Center collapsed following a terrorist attack, Sept. 11, 2001. (AP Photo/Robert Mecea, Newsday/FILE) ( SEPT. 11 ANNIVERSARY )

Destroyed mullions, the vertical struts which once faced the soaring outer walls of the World Trade Center towers, are the only thing left standing behind a lone fireman, after a terrorist attack on the twin towers of lower Manhattan Tuesday, Sept. 11, 2001. (AP Photo/Mark Lennihan) ( September 11 NYC Aftermath )

A man with a fire extinguisher walks through rubble after the collapse of the first World Trade Center Tower 11 September, 2001, in New York. The man was shouting as he walked looking for victims who needed assistance. Both towers collapsed after being hit by hijacked passengers planes. AFP PHOTO Doug KANTER ( APW2001091109700 )

The rubble of the World Trade Center smolders following a terrorist attack 11 September 2001 in New York. AFP PHOTO/Alexandre Fuchs ( APW2001091209843.jpg )

Edward Fine covering his mouth as he walks through the debris after the collapse of one of the World Trade Center Towers in New York. Fine was on the 78th floor of 1 World Trade Center when it was hit by a hijacked plane 11 September, 2001. AFP PHOTO/Stan HONDA ( Par351822 )

People flee lower Manhattan across the Brooklyn Bridge in New York, Tuesday, Sept. 11, 2001, following a terrorist attack on the World Trade Center. (AP Photo/Daniel Shanken) ( September 11th Terrorist Attacks )

Brooklyn firefighters George Johnson, left, of ladder 157, Dan McWilliams, center, of ladder 157, and Billy Eisengrein, right, of Rescue 2, raise a flag at the World Trade Center in New York, Sept. 11, 2001, as work at the site continues after hijackers crashed two airliners into the center. (AP Photo/ Copyright 2001 The Record (Bergen County, NJ), Thomas E. Franklin, Staff Photographer/FILE) ( Photos Of The Decade Sept. 11 )

Deputy U.S. marshal Dominic Guadagnoli helps a women after she was injured in the terrorist attack on the World Trade Center in New York, Tuesday, Sept. 11, 2001. (AP Photo/Gulnara Samoilova) ( September 11th Terrorist Attacks )

Firefighters walk through smoldering debris at the site of the World Trade Center in New York Tuesday, Sept. 11, 2001. (AP Photo/Graham Morrison) ( September 11th Terrorist Attacks )

People flee the scene near New York's World Trade Center after terrorists crashed two planes into the towers Tuesday, Sept. 11, 2001. (AP Photo/Diane Bondareff) ( September 11th Terrorist Attacks )

Pedestrians flee the area of the World Trade Center in lower Manhattan following a terrorist attack on the New York landmark Tuesday, Sept. 11, 2001. (AP Photo/Amy Sancetta) ( September 11th Terrorist Attacks )

Flames and smoke pour from a building at the Pentagon Tuesday, Sept. 11, 2001, after a direct, devastating hit from an aircraft. (AP Photo/Mandatory Credit, Will Morris) ( September 11th Terrorist Attacks )

Smoke comes out from the Southwest E-ring of the Pentagon building September 11, 2001 in Arlington, Va., after a plane crashed into the building and set off a huge explosion. (Photo by Alex Wong/Getty Images) ( 39426206pent_20010919_00246.jpg )

Construction workers continue to clear the rubble at the site of the World Trade Center, destroyed in the September 11, 2001 terrorist attacks, on September 15, 2001.(AP Photo/Wally Santana) ( September 11 NYC Aftermath )

Work continues at the Pentagon Monday, Sept. 17, 2001, six days after a hijacker flew American Airlines Flt. 77 into the building during the Sept. 11 attacks. (AP Photo/Ron Edmonds) ( September 11th Terrorist Attacks )

Officials examine the crater 11 September 2001 at the crash site of United Airlines Flight 93 in Shanksville, Pennsylvania. The plane from Newark, New Jersey, and bound for San Francisco, California, was hijacked and crashed in the field killing all 45 people on board. AFP PHOTO/David MAXWELL ( APW2001091209814 )

Cars are buried under debris in the aftermath of the September 11 attacks.(AP Photo/Shawn Baldwin) ( Attacks World Trade Center )

A truck sits in the rubble in lower Manhattan 11 September, 2001, in New York after two planes flew into the World Trade Center twin towers. AFP PHOTO Doug KANTER/AFP/Getty Images ( APW2001091109774.jpg )

An American flag flies over the rubble of the World Trade Center in New York, Sept. 13, 2001. (AP Photo/Beth A. Keiser, file) ( Sept 11 The Flag )

A New York City fireman calls for 10 more rescue workers to make their way into the rubble of the World Trade Center September 14, 2001 days after the September 11, 2001 terrorist attack. (U.S. Navy Photo by Jim Watson/Getty Images) ( 39455806wtc_20010917_00189.jpg )

The Statue of Liberty can be seen at first light from a view from Jersey City, N.J., as the lower Manhattan skyline is seen though a thick smoke filled the sky early Saturday, Sept. 15, 2001. (AP Photo/Dan Loh) ( September 11th Terrorist Attacks )