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. Dave Sanders/New York Times via AP

Dave Sanders/New York Times via AP

Across the country, ceremonies are being held to honor the thousands killed in the Sept. 11, 2001 terror attacks, when commercial planes crashed into the