Americans on Tuesday are marking the 17th anniversary of the Sept. 11, 2001 terrorist attacks that killed almost 3,000 people in New York, Virginia and Pennsylvania
US Marks 17th Anniversary of 9/11 Attacks
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A U.S. flag is unfurled at sunrise on Sept. 11, 2018, at the Pentagon.
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New York City firefighters salute in front of a memorial outside a firehouse adjacent to One World Trade Center and the 9/11 Memorial site in New York, Sept. 11, 2018.
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Family members of Flight 93 observe the September 11th Flight 93 Memorial in Shanksville, Pennsylvania, Sept. 11, 2018.
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Guests mark the 17th anniversary of the 9/11 attacks on the World Trade Center, at the National 9/11 Memorial and Museum in New York, Sept. 11, 2018.