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People react as they attend a ceremony marking the 20th anniversary of the Sept. 11, 2001, terrorist attacks at the National September 11 Memorial and Museum in New York on Saturday.
A National Park Service ranger stands in front of the Wall of Names at the Flight 93 National Memorial in Shanksville, Pa.
Former first lady Michelle Obama, President Joe Biden and first lady Jill Biden attend a ceremony marking the 20th anniversary of the Sept. 11, 2001, terrorist attacks at the National September 11 Memorial and Museum in New York on Saturday.
A memorial flag is brought onto the stage during ceremonies to commemorate the 20th anniversary of the Sept. 11 terrorist attacks, Saturday, Sept. 11, 2021, at the National September 11 Memorial & Museum in New York.
Nation & World 
