Looking back and ahead, America remembers 9/11
Sept 11 Anniversary
Credit: AP
President Barack Obama, right, first lady Michelle Obama, second from right, former President George W. Bush second from left, and former first lady Laura Bush arrive 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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