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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President Donald Trump and first lady Melania Trump stand for a moment of silence to mark the anniversary of the Sept. 11 terrorist attacks, on the South Lawn of the White House in Washington, Sept. 11, 2017.
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Family members read names of victims at the National 9/11 Memorial and Museum during ceremonies marking the 16th anniversary of the September 11, 2001 attacks in New York, Sept. 11, 2017.
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A woman wipes away tears as she holds up a picture during a ceremony at ground zero in New York, Sept. 11, 2017.
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Police and Fire Department officers hold an American flag that flew over the World Trade Center at the National 911 Memorial and Museum during ceremonies marking the 16th anniversary of the September 11, 2001 attacks in New York, Sept. 11, 2017.
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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.
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U.S. and NATO soldiers stand guard during a ceremony to commemorate the Sept. 11, 2001 terrorist attack on the World Trade Center in New York, in Resolute Support headquarters, in Kabul, Afghanistan, Sept. 11, 2017.
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A man stands at the edge of a waterfall pool at ground zero during a ceremony on the 16th anniversary of the 9/11 attacks in New York, Sept. 11, 2017.
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A couple embraces on the Brooklyn Promenade as the Tribute in Light rises above the lower Manhattan skyline in New York, Sept. 10, 2017.