In photos: Remembering the Sept. 11 attacks, 25 years later

A woman places flowers at the September 11 memorial plaza in Lower Manhattan ahead of a ceremony commemorating the 25th anniversary of the Sept. 11, 2001, attacks at the National September 11 Memorial in New York on Friday.

Around the U.S., ceremonies commemorate the 25th anniversary of the Sept. 11th terror attacks in New York and at the Pentagon.

(Image credit: Dave Sanders/New York Times via AP)