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
9
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.
10
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.
11
A couple embraces on the Brooklyn Promenade as the Tribute in Light rises above the lower Manhattan skyline in New York, Sept. 10, 2017.