Photos: 9/11 Memorial
Sept 11 Anniversary
Credit: AP
President Barack Obama, righ, first lady Michelle Obama,second from right, former President George W. Bush, second from left, and former first lady Laura Bush observe a moment of silence 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)
