Looking back and ahead, America remembers 9/11
Sept 11 Anniversary
Credit: AP
President Barack Obama and former President George W. Bush greet family members of those who died during the attacks on the World Trade Center at the National September 11 Memorial during 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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