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U.S. Secretary of the Department of Homeland Security Jeh Johnson speaks during a remembrance service at the Flight 93 National Memorial in Shanksville, Pennsylvania September 11, 2015. Relatives gathered to commemorate nearly 3,000 people killed in the September 11 attacks in New York, Pennsylvania and outside Washington 14 years ago, when airliners hijacked by al Qaeda militants brought death, mayhem and destruction. Mark Makela / Reuters
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