Looking back and ahead, America remembers 9/11
Sept 11 Anniversary
Credit: AP
Police and firefighters march in formation as they carry a folded flag past one of the memorial pools at the Sept. 11 memorial, during the 10th anniversary observance of the terrorist attacks on the World Trade Center, Sunday, Sept. 11, 2011, in New York,. (AP Photo/Seth Wenig, Pool)
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