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

1
An American flag is seen in the engraved names of 9/11 victims that sits on the edge of the north reflecting pool at the 9/11 Memorial in lower Manhattan, New York, Sept. 11, 2019.

2
President Donald Trump and first lady Melania Trump participate in a moment of silence honoring the victims of the Sept. 11 terrorist attacks, on the South Lawn of the White House, Sept. 11, 2019, in Washington.

3
A boy holds up a photo of a 9/11 victim during the reading of victims' names during ceremonies at the 911 Memorial in lower Manhattan, New York, Sept. 11, 2019.

4
Officers carry an American flag into ceremonies commemorating at the 911 Memorial in lower Manhattan, New York, Sept. 11, 2019.