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U.S. President Barack Obama and first lady Michelle Obama take part in a moment of silence marking the eighth anniversary of the September 11 attacks on New York, Washington, and Pennsylvania, on the South Lawn at the White House in Washington, September 11, 2009.
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US President Barack Obama lays a wreath at the Pentagon during a ceremony on the eighth anniversary of the attacks against the United States of September 11, 2001 in Arlington, September 11, 2009. [Agencies]
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