Looking back and ahead, America remembers 9/11
Sept 11 Anniversary
Credit: AP
New York City police and firefighters, and Port Authority of NY and NJ police line up at one of the entrances of 9/11 Memorial Plaza before the 10th anniversary ceremony at the site of the World Trade Center, Sunday, Sept. 11, 2011, in New York. (AP Photo/Chip Somodevilla, Pool)
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