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Elle Jackman,6, helps her mother, Iris Jackman, do a rubbing of her aunt's name, Brook Alexander Jackman, on the wall of the north pool of the Sept. 11 memorial during 10th anniversary observance of the terrorist attacks at the World Trade Center, Sunday, Sept. 11, 2011, in New York. (AP Photo/Justin Lane, Pool)

Memorable moments: Ground Zero memorial ceremony

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