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PHOTO GALLERY: Iconic photos of the 9/11 attacks




A photo taken on September 11, 2001 by the New York City Police Department as the North Tower collapses, engulfing lower Manhattan in smoke and ash (Photo: AP)

U.S. President George W. Bush listens as White House Chief of Staff Andrew Card informs him of a second plane hitting the World Trade Centre while Bush was conducting a reading seminar at the Emma E. Booker Elementary School in Sarasota, Florida, on September 11, 2001 (Photo: Reuters)

Smoke pours from a gaping hole and the upper floors of the World Trade Center's North Tower, shortly after hijackers crashed American Airlines Flight 11 into the building on September 11, 2001 in New York City (Photo: AP)

Smoke billows from the World Trade Center in lower Manhattan in this image taken by a U.S. Geological Survey satellite that flew over the region at about 9:30 a.m. on Tuesday, September 11, 2001 (Photo: AP)

United Airlines Flight 175 flies low toward the South Tower of the World Trade Center, shortly before slamming into the structure. The north tower burns after an earlier attack by a hijacked airliner in New York City, on September 11, 2001 (Photo: Reuters)

Flames erupt from the South Tower of the World Trade Center, after it was struck by hijacked United Airlines Flight 175, in New York City, on September 11, 2001 (Photo: Reuters)

The twin towers of the World Trade Center burn behind the Empire State Building in New York, on Tuesday, September 11, 2001 (Photo: AP)

At 9:59 a.m., after burning for 56 minutes, the South Tower of New York's World Trade Center begins to collapse after a terrorist attack on September 11, 2001 (Photo: AP)

Debris rains down on the street as the South Tower of the World Trade Center collapses after hijacked planes crashed into the towers on September 11, 2001 in New York City (Photo: AP)

This photo taken September 11, 2001 by the New York City Police Department shows smoke and ash engulfing the area around the World Trade Center as the North Tower collapses in New York (Photo: AP)

Dust, smoke and ash engulf buildings around the World Trade Center in New York City, after the collapse of both towers on September 11, 2001. Photo taken by the New York City Police Department (Photo: AP)

People run from the collapse of World Trade Center towers in New York, on September 11, 2001, after terrorists crashed two hijacked airliners into the World Trade Center and brought down the twin 110-story towers (Photo: AP)

A firefighter pauses on a bench as he works in lower Manhattan at the scene of the World Trade Center terrorist attack, on September 11, 2001 (Photo: AP)

New York City firefighters pour water on the wreckage of 7 World Trade Center in New York City early on September 12, 2001. 7 World Trade Center was destroyed along with both the landmark World Trade Center towers after being struck by planes in a terrorist attack on September 11 (Photo: Reuters)

A group of firefighters walk amid rubble near the base of the destroyed south tower of the World Trade Center in New York, on September 11, 2001 (Photo: Reuters)

A man stands in the rubble of the World Trade Center in New York City, calling out, asking if anyone needs help, after the collapse of the World Trade Center Towers on September 11, 2001 (Photo: AFP)

Two women hold each other as they watch the World Trade Center burn following a terrorist attack on the twin skyscrapers in New York City on September 11, 2001 (Photo: AP)

An American flag flies near the base of the destroyed World Trade Center, Sept 11, 2001 (Photo: Reuters)

The North Tower of the World Trade Center dissolves in a cloud of dust and debris about a half hour after the first twin tower collapsed, on September 11, 2001. The photo was taken from across the Hudson River in Jersey City, New Jersey. (Photo: Reuters)