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U.S. President Barack Obama and U.S. first lady Michelle Obama observe a moment of silence on the 13th anniversary of the 9/11 attacks at the White House in Washington September 11, 2014. Politicians, dignitaries and victims' relatives were gathering in New York, Washington and Pennsylvania on Thursday to commemorate the nearly 3,000 people killed in al Qaeda's attack on the United States 13 years ago on Sept. 11.  REUTERS/Kevin Lamarque  (UNITED STATES - Tags: POLITICS DISASTER SOCIETY ANNIVERSARY) - RTR45UAW Kevin Lamarque/Reuters
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