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U.S. President Barack Obama (R) and first Lady Michelle Obama stand at a memorial pool with former President George W. Bush and Laura Bush during ceremonies marking the 10th anniversary of the 9/11 attacks on the World Trade Center, in New York September 11, 2011. (REUTERS/Timothy A. Clary/Pool)

Memorable moments: Ground Zero memorial ceremony

A collection of moments from the 9/11 anniversary memorial ceremony in New York.