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Firefighters work in the rubble of the World
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Firefighters work in the rubble of the World Trade Center towers in New York, Wednesday, Sept. 12, 2001. The towers collapsed Tuesday after being struck by two commercial aircrafts in a terrorist attack.(Credit: AP)

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Ground Zero immediately after 9/11 photos

Thousands of emergency responders work at Ground Zero in the immediate aftermath of 9/11, after terrorists crashed two airliners into the World Trade Center on Sept. 11, 2001.