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Associated Press
New York City Mayor Michael Bloomberg, left, joins Stephen Knapp Jr., right, and his family as they lay flowers during a ceremony to honor the six people who died 20 years ago in the first terrorist attack on the World Trade Center, Tuesday, Feb. 26, 2013 in New York. Knapp's father, Stephen Knapp, was killed in the bombing. About 50 people attended the ceremony, held at the 9/11 memorial, where the twin towers were destroyed eight years later. The moment of silence was observed at 12:18 p.m., the time when a truck bomb was detonated below the north tower. The victims' names were read by family members before bagpipers played "Amazing Grace."  (AP Photo/Mary Altaffer)

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