Americans are marking the 18th anniversary of the Sept. 11, 2001 terrorist attacks that killed almost 3,000 people in New York, Virginia and Pennsylvania.
In Pictures: Americans Mark Anniversary of 9/11 Attacks
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Airline employees visit the north reflecting pool during ceremonies at the 911 Memorial in lower Manhattan, New York, Sept. 11, 2019.
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Crowd members participate in a moment of silence honoring the victims of the Sept. 11 terrorist attacks, at the Pentagon, Sept. 11, 2019..
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Flowers rest on a bench bearing a name in memory of retired U.S. Army Lieutenant Colonel Gary Smith before a ceremony in observance of the 18th anniversary of the 9/11 attacks at the Pentagon in Washington, Sept. 11, 2019.
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Visitors to the Flight 93 National Memorial in Shanksville, Pa., participate in a sunset memorial service, Sept. 10, 2019, as the nation prepares to mark the 18th anniversary of the 9/11 attacks.
