AP Photo/Doug Mills

View a collection of some of the iconic images from the Sept. 11, 2001, terrorist attacks.

President Bush gets word of attacks
AP Photo/Doug Mills

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.

People flee lower Manhattan
AP Photo/Suzanne Plunkett

People run from the collapse of World Trade Center towers in New York, Tuesday, Sept. 11, 2001 after terrorists crashed two hijacked airliners into the World Trade Center and brought down the twin 110-story towers.

People are seen in tower windows
AP Photo/Amy Sancetta

People hang out of broken windows of the North Tower of the World Trade Center after a terrorist attack in New York on the morning of Sept. 11, 2001.

Firemen walk amid debris
AP Photo/Richard Cohen

Firemen walk through a dust and debris covered street in lower Manhattan Tuesday, Sept. 11, 2001, after a terrorist attack at the World Trade Center. Two jet planes were crashed into the twin towers, collapsing them and covering the area with the debris.

Scene of Statue of Liberty, Manhattan
AP Photo/Daniel Hulshizer

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

Reaction watching the towers burn
AP Photo/Ernesto Mora

Two women hold each other as they watch the World Trade Center burn following a terrorist attack on the twin skyscrapers in New York Tuesday, Sept. 11, 2001. Terrorists crashed two planes into the World Trade Center and the twin 110-story towers collapsed Tuesday morning.

Aftermath at the Pentagon
AP Photo/Tech. Sgt. Cedric H. Rudisill

The Pentagon attack site is shown Friday, Sept. 14, 2001, after a plane slammed into the building on Tuesday, Sept. 11. The terrorist attack caused extensive damage to the west face of the building.

Searching for the missing
AP Photo/Stuart Ramson

Captain James Henry of Ladder 149, holds a picture of his nephew, firefighter Joseph Henry, missing from the World Trade Center disaster, Friday, Nov. 2, 2001, during a rally in New York. Angry New York City firefighters protested a plan to scale back the number of fire and police personnel searching for remains at the World Trade Center disaster site.

South tower collapses
AP Photo/Jim Collins

The south tower collapses as smoke billows from both towers of the World Trade Center, in New York, 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 in a deadly series of blows that brought down the twin 110-story towers.

Firemen deploy at towers
AP Photo/Mark Lennihan

Firemen are deployed near the site of the World Trade Center in New York, Wednesday, Sept. 12, 2001. In the most devastating terrorist onslaught ever waged against the United States, knife-wielding hijackers crashed two airliners into the World Trade Center on Tuesday, toppling its twin 110-story towers.

United Flight 93 crash site
AP Photo/Keith Srakocic

Emergency workers look at the crater created when United Airlines Flight 93 crashed near Shanksville, Pa., on Tuesday, Sept. 11, 2001. Radar showed the San Francisco-bound Boeing 757 from Newark, N.J., had nearly reached Cleveland when it made a sharp left turn and headed back toward Pennsylvania, crashing in a grassy field edged by woods about 80 miles southeast of Pittsburgh. FBI spokesman Jeff Killeen confirmed there were no survivors.

Public reaction to the attacks
AP Photo/Gary Tramontina

A sign is held up in the crowd before a memorial service for victims of United Airlines Flight 93, in Somerset, Pa. Friday, Sept. 14, 2001. Volunteers led a prayer service Friday as investigators continued to comb through the wreckage of the airliner searching for the second so-called "black box," the plane's cockpit voice recorder in nearby Shanksville.

Smoke pours, United Flight 175 hits
AP Photo/Chao Soi Cheong

Smoke pours off one of the towers of the World Trade Center as flames explode from the second one as it is struck by United Flight 175 Tuesday, Sept. 11, 2001, after terrorists crashed planes into the buildings. The attack collapsed both buildings.

President Bush visits ground zero
AP Photo/Doug Mills

President George W. Bush embraces firefighter Bob Beckwith while standing in front of the collapsed World Trade Center buildings in New York as rescue efforts continue Sept. 14, 2001.