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Former President George W. Bush, far right, speaks to friends and relatives of the victims of 9/11 as former first lady Laura Bush, from left, first lady Michelle Obama and President Barack Obama listen during a ceremony marking the 10th anniversary of the attacks at the National September 11 Memorial at the World Trade Center site Sunday, Sept. 11, 2011, in New York. (AP Photo/Jason DeCrow)

Memorable moments: Ground Zero memorial ceremony

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