9/11 Images

9/11 Images We Will Never Forget - A series of photos shows hijacked United Airlines Flight 175 as it strikes the south tower of the World Trade Center at 9:03 a.m. on Sept. 11, 2001, and then explodes. A giant hole in the north tower shows where it was hit by American Airlines Flight 11, 43 minutes earlier. A total of 2,753 people died in the al-Qaida-sponsored terrorist attack on the World Trade Center.

As the north tower of the World Trade center burns in the background, United Airlines Flight 175 is lined up to strike the south tower at 9:03 a.m. on Sept. 11, 2001. Terrorists took over that flight and also American Airlines Flight 11, crashing the planes into the twin towers.

Fuel onboard United Flight 175 explodes in a horrific fireball just after the plane hits the south tower of the World Trade Center on Sept. 11, 2001. Fires ignited by the two crashes would later cause the twin towers to collapse.

Flames, debris and smoke burst from the south tower of the World Trade Center as it is struck by United Airlines Flight 175 on Sept. 11, 2001. Although the south tower was the second to be struck, it would be the first to collapse.

Fires burn out of control on several floors of the twin towers of the World Trade Center shortly after terrorists flew two fully fueled jetliners into them on Sept. 11, 2001.

A person falls headfirst after jumping out of the burning north tower of the World Trade Center on Sept. 11, 2001. Many jumped from the building’s upper floors to escape smoke and flames caused after two airliners were crashed into the buildings by terrorists.

Spectators watch in horror as the twin towers of the World Trade Center burn after two airplanes slammed into them on the morning of Sept. 11, 2001.

People run for their lives as the twin towers of the World Trade Center collapse on Sept. 11, 2001. Nearby streets were filled with debris and choking clouds of dust.

A fireball erupts from the western side of the Pentagon in Washington, D.C., as hijacked American Airlines Flight 77 crashes into it at 9:37 a.m. on Sept. 11, 2001. The terrorist attack claimed the lives of 125 people in the building and 64 people on the plane.

Emergency crews spray water on the burning Pentagon approximately three hours after a hijacked jetliner crashed into the building’s west side on Sept. 11, 2001. Part of the building collapsed 32 minutes after the crash.

Medical personnel treat injured Pentagon workers on the lawn in front of the west side of the burning building on Sept. 11, 2001.

President George W. Bush is informed by Andrew Card, his chief of staff, of the terrorist attacks on the World Trade Center and the Pentagon on Sept. 11, 2001. At the time of the attacks, Bush was attending an event to promote reading at an elementary school in Sarasota, Fla.

FBI investigators examine the wreckage of United Airlines Flight 93 near Shanksville, Pa., on Sept. 12, 2001. Terrorists commandeered the plane on Sept. 11 and intended to crash it into either the Capitol Building or the White House in Washington, D.C. After passengers tried to take control of the plane, the hijackers crashed it.

Police and pedestrians run for cover as the south tower of the World Trade Center collapses in a deafening roar at 9:59 a.m. on Sept. 11, 2001. Dust and debris cover the area surrounding the tower.

Marcy Borders, covered with dust from the collapse of one of the World Trade Center towers, seeks refuge in an office building on Sept. 11, 2001. She was caught outside as smoke, dust and debris from the collapse covered the area for blocks around the World Trade Center.

New York City firefighters carry an injured firefighter away from the rubble of the twin towers at the World Trade Center. The New York City Fire Department suffered 343 fatalities on Sept. 11, 2001, "the largest loss of life of any emergency response agency in history," according to the 9/11 Commission Report.

Frightened bystanders flee from the scene of the collapsing twin towers of the World Trade Center in New York City on Sept. 11, 2001.