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.