The United States is marking the 14th anniversary of the September 11th terrorist attacks on Friday with a series of observances to remember that horrifying day.
US Marks 14th Anniversary of 9/11 Attacks
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Lanterns 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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Defense 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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Chris Miller, right, and Terry Miller, center, look for their brother Robert Cromwell Miller's name on the "Empty Sky" memorial to New Jersey's victims of the 9/11 2001 terrorist attacks, as nephew James Miller, left, looks on early on Sept. 11, 2015, in

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An unidentified man takes photos before sunrise at the National 9/11 Pentagon Memorial, Sept. 11, 2015, on the 14th anniversary of the 911 attacks.