Looking back and ahead, America remembers 9/11
Sept 11 Anniversary
Credit: AP
Robert Peraza pays respects at the site where his son Robert David Peraza's name is engraved at the north pool at the National September 11 Memorial for a ceremony marking the 10th anniversary of the attacks at World Trade Center, Sunday, Sept. 11, 2011 in New York. (AP Photo/Mary Altaffer)
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