Attack on the World Trade Center

394261 77: Smoke spews from a tower of the World Trade Center September 11, 2001 after two hijacked airplanes hit the twin towers in an alleged terrorist attack on New York City. (Photo by Mario Tama/Getty Images)

World Trade Center Attack

394261 111: 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)

A hijacked commercial plane approaches t

(SETH MCALLISTER/AFP/Getty Images)

An US flag is seen amidst debris in the

An US flag is seen amidst debris in the cemetery at Trinity Church next to the World Trade Center 13 September, 2001 in New York. The twin towers at the center were destroyed 11 September when hijacked airplanes crashed into the towers. AFP PHOTO Pool/Beth A. KEISER (Photo credit should read BETH A. KEISER/AFP/Getty Images)

Firefighters Make Way Through The Rubble

Photo dated 11 September 2001 shows firefighters making their way through the rubble of the World Trade Center in New York after two hijacked planes flew into the landmark skyscrapers. The fifth anniversary of September 11 finds the United States bloodied by foreign war, polarized politically and coping with terrorism's curbs on freedom which helped define American life. AFP PHOTO/FILES/Doug KANTER **MORE PICTURES AVAILABLE ON WWW.IMAGEFORUM2.AFP.COM** (Photo credit should read DOUG KANTER/AFP/Getty Images)

Pedestrians run from the scene as one of

Pedestrians run from the scene as one of the World Trade Center Towers collapses 11 September, 2001 in New York following a terrorist plane crash on the twin towers. AFP PHOTO Doug KANTER (Photo credit should read DOUG KANTER/AFP/Getty Images)

This 11 September 2001 file photo shows

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. The woman was caught outside on the street as the cloud of smoke and dust enveloped the area. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

Part of the facade of one of the twin to

Part of the facade of one of the twin towers of the World Trade Center still stands as rescue and cleaning efforts continue 13 September 2001 at the site of the terrorist-attacked buildings in New York. AFP PHOTO/Pool-Beth A. KEISER (Photo credit should read BETH A. KEISER/AFP/Getty Images)

New York Governor George Pataki (L), New

New York Governor George Pataki (L), New York City Mayor Rudolph Giuliani (C) and US Senator Hillary Rodham Clinton (R), D-NY, tour the site of the World Trade Center disaster 12 September 2001 in New York. AFP PHOTO/POOL/Robert F. Bukaty (Photo credit should read ROBERT F. BUKATY/AFP/Getty Images)

The rubble of the World Trade Center smo

The rubble of the World Trade Center smoulders following a terrorist attack 11 September 2001 in New York. A hijacked plane crashed into and destroyed the landmark structure. AFP PHOTO/Alexandre Fuchs (Photo credit should read ALEXANDRE FUCHS/AFP/Getty Images)

Police and pedestrians run for cover dur

Police and pedestrians run for cover during the first collapse of the World Trade Center Tower after the landmark skyscrapers were struck by two hijacked airplanes 11 September 2001 in New York . AFP PHOTO/Doug KANTER (Photo credit should read DOUG KANTER/AFP/Getty Images)

Pedestrians on the waterfront in Brookly

Pedestrians on the waterfront in Brooklyn, New York, look across the East River to the burning World Trade Center towers 11 September, 2001 after a terrorist attack. AFP PHOTO Henny Ray ABRAMS (Photo credit should read HENNY RAY ABRAMS/AFP/Getty Images)

Pedestrians walk across the Brooklyn Bri

Pedestrians walk across the Brooklyn Bridge away from the burning World Trade towers before their collapse 11 September, 2001. Both towers were hit by reportedly hijacked passenger planes in a suspected terrorist attack. Both towers later collapsed. AFP PHOTO Henny Ray ABRAMS (Photo credit should read HENNY RAY ABRAMS/AFP/Getty Images)

Firemen leave the rescue area near the W

Firemen leave the rescue area near the World Trade Center after their shift 13 September 2001, in New York. Rescue efforts continue at the World Trade Center after the twin towers were destroyed 11 September 2001 by terrorists in hijacked commercial aircraft. AFP PHOTO Roberto SCHMIDT (Photo credit should read ROBERTO SCHMIDT/AFP/Getty Images)

President George Bush with Firefighter

Photo dated 14 September 2001 shows US President George W. Bush (L), standing next to retired firefighter Bob Beckwith, 69, as he speaks to volunteers and firemen after surveying the damage at the site of the World Trade Center in New York. The fifth anniversary of September 11 finds the United States bloodied by foreign war, polarized politically and coping with terrorism's curbs on freedom which helped define American life. AFP PHOTO/FILES/Paul J. RICHARDS **MORE PICTURES AVAILABLE ON WWW.IMAGEFORUM2.AFP.COM** (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)

Covering Mouth From Debris

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. Americans mark the fourth anniversary of the September 11, 2001 terror attacks Sunday nagged by new burning questions about their readiness to confront a major disaster after the debacle of Hurricane Katrina. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

Pedestrians run

Pedestrians run from the scene as one of the World Trade Center Towers collapses 11 September, 2001 in New York following a terrorist plane crash on the twin towers. Americans mark the fourth anniversary of the September 11, 2001 terror attacks Sunday nagged by new burning questions about their readiness to confront a major disaster after the debacle of Hurricane Katrina. AFP PHOTO Doug KANTER (Photo credit should read DOUG KANTER/AFP/Getty Images)

Firefighters make their way through the rubble

Firefighters make their way through the rubble of the World Trade Center 11 September 2001 in New York after two hijacked planes flew into the landmark skyscrapers. Americans mark the fourth anniversary of the September 11, 2001 terror attacks Sunday nagged by new burning questions about their readiness to confront a major disaster after the debacle of Hurricane Katrina. AFP PHOTO/Doug KANTER (Photo credit should read DOUG KANTER/AFP/Getty Images)

World Trade Center

NEW YORK, NY - SEPTEMBER 11: 2/10 US-ATTACKS-2ND YEAR ANNIVERSARY (FILES) This file photo dated 11 September 2001shows the one of the towers of the World Trade Center begining to collapse after suspected terrorist controlled hijacked airliners crashed into both buildings. The all-out war on terrorism unleashed by Washington after the attacks marked a turning point in US-Arab relations and nowhere more so than in once top ally Saudi Arabia. With 15 of the 19 suicide hijackers carrying Saudi nationality and mastermind Osama bin Laden being the scion of a leading Saudi family, the desert kingdom and world oil kingpin, suddenly found itself on the frontline of the war on terror prosecuted by US President George W. Bush. (Photo credit should read JIM SULLEY/AFP/Getty Images)

A man with a fire extinguisher walks through rubbl

NEW YORK, UNITED STATES: 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 (Photo credit should read DOUG KANTER/AFP/Getty Images)

Andrea Petrarca closes her eyes and cups a candle

BOULDER, UNITED STATES: Andrea Petrarca closes her eyes and cups a candle while saying a prayer for the victims of the 11 September terrorist plane attacks on the World Trade Center in New York and the Pentagon in Washington, at an impromptu candle memorial late 14 September, 2001 near the Boulder County Court House in Boulder, CO. Some 300 candles were set up by sympathizers. AFP PHOTO MARK LEFFINGWELL (Photo credit should read MARK LEFFINGWELL/AFP/Getty Images)

Rescue workers survey damage to the World Trade Ce

NEW YORK, UNITED STATES: Rescue workers survey damage to the World Trade Center 11 September, 2001 in New York. Two planes controlled by hijackers crashed into the twin towers of the center destroying the buildings. At almost the same time, another hijacked plane flew into the Pentagon in Washington, DC. AFP PHOTO Doug KANTER (Photo credit should read DOUG KANTER/AFP/Getty Images)

Lunchtime workers watch a giant screen in Martin P

SYDNEY, AUSTRALIA: Lunchtime workers watch a giant screen in Martin Place Sydney, 12 September 2001, showing graphic images of the twin towers of the World Trade Centre in New York City after they were hit by two hijacked passenger jets. Major US cities including New York and Washington, as well as the Pentagon, were targets of the act of terrorism. AFP PHOTO/Greg WOOD (Photo credit should read GREG WOOD/AFP/Getty Images)

President in Florida when informed of attacks

SARASOTA, UNITED STATES: (FILES): This 11 September 2001 file photo from an early morning school reading event Sarasota, Florida, shows White house Chief of Staff Andrew Card (L) informing US President George W. Bush (R) of the attacks on the World Trade Center in New York. A bipartisan US commission pins the blame for the 11 September 2001 terror attacks on a broad array of lapses by federal and local law enforcement officials and intelligence agencies, in its final report to be released 22 July 2004. AFP PHOTO/FILES/Paul J. RICHARDS (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)

Surveillance Camera Photographs Two Men Identified By Authorities

394718 01: A Surveillance Camera Photographs Two Men Identified By Authorities As Suspected Hijackers Mohammed Atta (R) And Abdulaziz Alomari (C) As They Pass Through Airport Security September 11, 2001 At Portland International Jetport In Maine. Authorities Say The Two Men Took A Commuter Flight To Boston Before Boarding American Airlines Flight 11, Which Was One Of Four Jetliners Hijacked On September 11 And One Of Two Which Were Crashed Into New York City's World Trade Center. (Photo By U.S. Navy/Getty Images)

Smoke Pours From The World Trade Center After Being Hit By Two Planes September 11 2001

394261 09: Smoke Pours From The World Trade Center After Being Hit By Two Planes September 11, 2001 In New York City. (Photo By Craig Allen/Getty Images)

Fire Ball Explodes One Of The Towers At The World Trade Center After Being Hit By Two P

394261 08: A Fire Ball Explodes One Of The Towers At The World Trade Center After Being Hit By Two Planes September 11, 2001 In New York City. (Photo By Craig Allen/Getty Images)

Ground Zero Overview

NEW YORK - SEPTEMBER 13: New York City firefighters look at the detroyed facade of the World Trade Center September 13, 2001 two days after the twin towers were destroyed when hit by two hijacked passenger jets. (Photo by Chris Hondros/Getty Images)

World Trade Center Attacked

NEW YORK - SEPTEMBER 11: 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. The crash of two airliners hijacked by terrorists loyal to al Qaeda leader Osama bin Laden and subsequent collapse of the twin towers killed some 2,800 people. (Photo by Spencer Platt/Getty Images)

New York Police Memorial Service

NEW YORK - SEPTEMBER 9: A New York police officer looks on during a memorial service honoring police personnel killed in the line of duty September 9, 2002 in New York City. Twenty-five names were added to the memorial wall this year including the 23 NYPD officers killed in the September 11th terrorist attacks. (Photo by Mario Tama/Getty Images)

Attack on New York City

NEW YORK - SEPTEMBER 11: An unidentified New York City firefighter walks away from Ground Zero after the collapse of the Twin Towers September 11, 2001 in New York City. The World Trade Center's Twin Towers and the Pentagon were attacked by terrorists using commercial airliners as missiles. (Photo by Anthony Correia/Getty Images)

September 11 Retrospective

NEW YORK - FEBRUARY 15: (SEPTEMBER 11 RETROSPECTIVE) As the sun sets over New Jersey, cleanup and recovery efforts continue at the site of the World Trade Center disaster February 15, 2002 in New York City. (Photo by Spencer Platt/Getty Images)

September 11 Retrospective

FT. LAUDERDALE, FL - OCTOBER 15, 2001: (SEPTEMBER 11 RETROSPECTIVE) Ralph Madonia from the Fort Lauderdale Fire Rescue Hazardous Materials Response Team secures his Bio Hazard suit October 15, 2001 as he responds to a report of a powdery substance found in Ft. Lauderdale, Florida. HazMat teams from around the country have been busy with calls related to the Anthrax scare. (Photo by Joe Raedle/Getty Images)

September 11 Retrospective

NEW YORK - APRIl 3: (SEPTEMBER 11 RETROSPECTIVE) The "Tribute in Light" memorial to the World Trade Center is seen from the Empire State Building April 3, 2002 in New York City. (Photo by Mario Tama/Getty Images)

September 11 Retrospective

ARLINGTON, VA - SEPTEMBER 14, 2001: (SEPTEMBER 11 RETROSPECTIVE) A military helicopter flies in front of the Pentagon September 14, 2001 in Arlington, Virginia at the impact site where a hijacked airliner crashed into the building. (Photo by Stephen J. Boitano/Getty Images)

September 11 Retrospective

NEW YORK - SEPTEMBER 11: (PUERTO RICO OUT) (SEPTEMBER 11 RETROSPECTIVE) 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)

September 11 Retrospective

NEW YORK - SEPTEMBER 11, 2001: (PUERTO RICO OUT) (SEPTEMBER 11 RETROSPECTIVE) People run away as the North Tower of World Trade Center collapses after a hijacked airliner hit the building September 11, 2001 in New York City. (Photo by Jose Jimenez/Primera Hora/Getty Images)

September 11 Retrospective

NEW YORK - SEPTEMBER 21, 2001: (SEPTEMBER 11 RETROSPECTIVE) NYPD police officer Ken Radigan rubs his eyes after briefly sleeping in a pew at St. Paul's Episcopal Chapel, near the site of the World Trade Center attack, September 21, 2001 in New York City. The chapel is serving as a relief area for rescue workers. (Photo by Mario Tama/Getty Images)

September 11 Retrospective

WASHINGTON - OCTOBER 11, 2001: (SEPTEMBER 11 RETROSPECTIVE) U.S. President George W. Bush holds an American flag during a Memorial Service at the Pentagon October 11, 2001 in Arlington, Virginia. (Photo by Mark Wilson/Getty Images)

September 11 Retrospective

NEW YORK - SEPTEMBER 11, 2001: (SEPTEMBER 11 RETROSPECTIVE) 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)

September 11 Retrospective

NEW YORK - SEPTEMBER 11, 2001: (SEPTEMBER 11 RETROSPECTIVE) Smoke pours from the twin towers of the World Trade Center after they were hit by two hijacked airliners in a terrorist attack September 11, 2001 in New York City. (Photo by Robert Giroux/Getty Images)

Bush Administration Deals with Terror Attacks on U.S

394509 01: U.S. President George W. Bush speaks to Vice President Dick Cheney by phone aboard Air Force One September 11, 2001 after departing Offutt Air Force Base in Nebraska. (Photo by Eric Draper/The White House/Getty Images)

Funeral for New York Firefighter Lt. Dennis Mojica

394771 03: Firefighters stand atop a fire engine with the flag draped casket of fellow fireman Lt. Dennis Mojica September 21, 2001 during a funeral service at St. Patrick's Cathedral in New York City. Mojica, who was with Rescue Company 1, is one of nearly 300 firefighters who lost their lives in the World Trade Center disaster. (Photo by Joe Raedle/Gettyimages)

Giuliani and Pataki Pray

394672 02: New York City Mayor Rudy Giuliani (R) and Governor George Pataki bow their heads in prayer at the beginning of a press conference September 19, 2001 in New York City. Giuliani said rescue efforts would continue for victims of the attack on the World Trade Center. (Photo by Mario Tama/Gettyimages)

First Firefighter Funeral After WTC Disaster

394471 06: Firefighters attend a funeral service for New York Fire Department Chaplain Rev. Mychal Judge, in front of the St. Francis of Assisi Church September 15, 2001 in New York City. Judge died while giving the last rites to a fireman in the collapse of the World Trade Center. The World Trade Center was destroyed after both the landmark towers were struck by two hijacked planes in an alleged terrorist attack on September 11. (Photo by Joe Raedle/Getty Images)

Candlelight Vigil in Union Square Park

394455 02: People mourn for the victims of the attack on the World Trade Center and Pentagon during a candle light vigil at Manhattan's Union Square Park September 14, 2001 in New York City. (Photo by Joe Raedle/Getty Images)

American Flags Fly at Half Staff

394566 02: American flags fly at half staff on the grounds of the Washington Monument in memory of the victims of the terror attacks in New York City and at the Pentagon September 17, 2001 in Washington, DC. (Photo by Alex Wong/Getty Images)

World Trade Center Attack

394558 06: 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)

London Mourners Remember US Terror Victims

394377 02: A female mourner is lost in her own thoughts September 13, 2001 in the Franklin D. Roosevelt Garden near the US Embassy in London, where floral tributes were laid after the terrorist attacks in the U.S. (Photo by Sion Touhig/Getty Images)

Satellite Images of Terrorist Attack Sites

394365 01: A satellite image of lower Manhattan shows smoke and ash rising from the site of the World Trade Center at 11:43 a.m. September 12, 2001 in New York City. (Photo by spaceimaging.com/Getty Images)

Aftermath of World Trade Center Attack

394359 07: A man watches smoke emit from the former site of the World Trade Center September 12, 2001 in Hoboken, N.J. Smoke filled the air all over lower Manhattan in the aftermath of Tuesday's terrorist attack and destruction of the World Trade Center. (Photo by Chris Hondros/Getty Images)

Aftermath of World Trade Center Attack

394359 06: Smoke pours from the former site of the World Trade Center in Manhattan September 12, 2001 from a vantage point in Hoboken, N.J. Smoke filled the air all over lower Manhattan in the aftermath of Tuesday's terrorist attack and destruction of the World Trade Center. (Photo by Chris Hondros/Getty Images)

Candle light Vigil at the US Capitol

394347 02: People hold candles on the U.S. Capitol grounds during a vigil to remember victims who lost there lives in the recent terrorist attacks September 12, 2001 in Washington DC. (Photo by Mark Wilson/Getty Images)

Terrorist Victim Vigil

394347 01: People cover themselves with an American Flag on the US Capitol grounds during a candle light vigil to remember victims who lost there life in the recent terorist attacks September 12, 2001 in Washington DC. (Photo by Mark Wilson/Getty Images)

Aftermath of Attack on US

394347 01: With the sun setting behind the Washington Monument, J.D. Dolan holds an American Flag up on the west side of the US Capitol building September 12, 2001, a day after terrorist attacks in Washington and New York killed thousands, in Washington, DC. (Photo by Mark Wilson/Getty Images)

World Trade Center Attack Aftermath

394304 07: Wellwishers cheer as recovery personnel drive by on their way to the World Trade Center site September 12, 2001 in New York City. (Photo by Mario Tama/Getty Images)

World Trade Center Hit by Two Planes

394263 04: (PUERTO RICO OUT) A person falls to his death from the World Trade Center after two planes hit the Twin Towers September 11, 2001 in New York City. (Photo by Jose Jimenez/Primera Hora/Getty Images)

A plane crashed into the Pentagon

394262 06: 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)

A plane crashed into the Pentagon

394262 02: Smoke comes out from the west wing 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)

World Trade Center Attacked

394261 38: People evacuate the area around the World Trade Center after it was hit by two planes September 11, 2001 in New York City. (Photo by Mario Tama/Getty Images)