President Donald Trump marks the 16th anniversary of the worst act of terrorism on U.S. soil in a ceremony at the White House, with a moment of silence at 8:40 a.m., the time when a first airliner hijacked by al-Qaida terrorists crashed into the World Trade Center in New York. A second jet hit the second WTC tower 23 minutes later, and the huge skyscrapers collapsed in flames and smoke soon afterwards.
In Photos: 9/11 Anniversary
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U.S. President Donald Trump lays a wreath during the 9/11 observance at the National 9/11 Pentagon Memorial in Arlington, Virginia, Sept. 11, 2017.
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New York City firefighters with Ladder 10 Engine 10 firehouse salute during a moment of silence, Sept. 11, 2017, at the World Trade Center in New York.
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West Virginia National Guard Staff Sgt. Sean Ruth, center, mourns the loss of his father, Army Chief Warrant Officer Ford, at the September 11th Pentagon Memorial, Sept. 11, 2017.
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People hold up signs with the names and pictures of victims of the 9/11 terrorist attacks during a ceremony at ground zero in New York, Sept. 11, 2017.