1/6Low clouds surround the top of the One World Trade Center tower, center left, at sunrise during the 14th anniversary of the terrorist attacks, Sept. 11, 2015.
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2/6Defense Secretary Ash Carter bows his head during a moment of silence at the Pentagon Memorial, Sept. 11, 2015, during a service on the 14th anniversary of the terrorist attacks.
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3/6On the 14th anniversary of the attack, a U.S. flag is draped on the side of the Pentagon, Sept. 11, 2015, where the building was attacked on September 11th in 2001.
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4/6President Barack Obama, first lady Michelle Obama and others observe a moment of silence to mark the 14th anniversary of the 9/11 attacks, on the South Lawn of the White House in Washington, Sept. 11, 2015.
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5/6Lanterns are carried during a candlelight memorial to the passengers and crew of United Flight 93, at the Flight 93 National Memorial in Shanksville, Pennsylvania, Sept. 10, 2015.
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6/6NATO forces observe a moment of silence during a memorial ceremony on the 14th anniversary of the 9/11 terrorist attacks on the United States, at the headquarters of the International Security Assistance Force, in Kabul, Afghanistan, Sept. 11, 2015.
