PHOTOS: The aftermath of 9/11 terror attacks in New York City

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Thursday, September 11, 2014
Destroyed mullions 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.
Destroyed mullions are examined by emergency workers, after a terrorist attack on the twin towers of lower Manhattan Tuesday, Sept. 11, 2001.
FIremen walk through a dust and debris covered street in lower Manhattan Tuesday, Sept. 11, 2001.
Rubble and ash fill lower Manhattan streets after two hijacked airliners were crashed into the towers of the World Trade Center in  New York, Tuesday, Sept. 11, 2001.
Ladder 4 truck is surrounded by makeshift memorials as it returns to its midtown New York firehouse after a call Tuesday, Sept. 18, 2001.
Work continued on the site of the World Trade Center as steam rises from the rubble in New York, Thursday, Oct. 11, 2001.
A fallen piece of metal after hijacked planes crashed into the twin towers of the World Trade Center on September 11, 2001.
In this September 21, 2001 photo, a dog has an American flag painted on its head as a memorial to the victims of the September 11 terrorist attacks.
A woman looks at missing person posters of victims of the September 11 terrorist attacks on the World Trade Center in New York City on Sept. 14, 2001.
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.
An area is  marked searched at the ruins of the World Trade Center disaster in New York, Saturday Sept. 29, 2001.
In this September 14, 2001 photograph, a man hold a candles and looks at missing person posters after the September 11 terrorist attacks on the World Trade Center in New York City.
In this September 14, 2001 photograph, a man comforts a woman in front of missing person posters after the September 11 terrorist attacks.
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.
People light candles on Sept. 13, 2001 at a memorial for the victims of the September 11 terrorist attacks on the World Trade Center in New York City.
Workers clean up rubble on September 15, 2001 at ground zero after the September 11, 2001 attacks in New York City
Steel I-beams and rubble cover the tracks of the #1 and #9 subway lines in a tunnel under the World Trade Center.
A large portrait of Father Mychael Judge, the FDNY chaplain who died in the World Trade Center collapse, is part of the memorial to firemen at Ladder 24, Engine 1
An ABC reporter in front of a car covered with posters of missing people from the September 11 terrorist attacks on the World Trade Center in NYC on Sept. 13, 2001.
The casket for New York City firefighter Thomas Foley of West Nyack, N.Y., is carried from St. Anthony's Church in Nanuet, N.Y., to St. Anthony's cemetery.
Two large cranes are positioned near the rubble of the World Trade Center in New York, on Wednesday, Sept. 26, 2001.
A man raises a flag at a prayer service on Sept. 15, 2001 after the September 11 terrorist attacks on the World Trade Center in New York City.
Construction workers and firemen 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.
Construction workers and firemen continue to clear the rubble at the site of the World Trade Center, destroyed in the September 11, 2001 terrorist attacks, on September 14, 2001.
A lone firefighter moves through piles of debris at the site of the World Trade Center in New York, Tuesday, Sept. 11, 2001
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PHOTOS: The aftermath of 9/11 terror attacks in New York CityDestroyed mullions 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

See images from the moments and days that followed the 9/11 terrorist attacks on the World Trade Center in New York City.