The United States is marking the 15th anniversary of the September 11th terrorist attacks, when al-Qaida terrorists hijacked four planes and flew them into the World Trade Center in New York and the Pentagon near Washington, while one crashed in rural Pennsylvania.
US Marks 15th Anniversary of 9/11 Attacks
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A mourner places a flag in the Empty Sky memorial on the morning of the 15th anniversary of the 9/11 attacks in New Jersey, Sept. 11, 2016.
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Candles in memory of the passengers and crew of Flight 93, are lit along the Wall of Names at the Flight 93 National Memorial in Shanksville, Pa., Sept. 10, 2016, as the nation marks the 15th anniversary of the Sept. 11 attacks.
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The Tribute in Light rises above the lower Manhattan skyline, Sept. 10, 2016, in New York to mark the fifteenth anniversary of the terrorist attacks of Sept. 11, 2001 on the United States.