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 hide caption

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 World Trade Center's twin towers, the Pentagon, and a field in Shanksville, Pa.

See photos of 25th anniversary commemorations from New York, Arlington, Va., Austin, Texas, Chicago, St. Louis, and Shanksville, Pa. .

Darlene Johnson and David Johnson, both of Florissant, Mo., look over one of the flags at the "Flags of Valor" installation on Thursday, Sept. 10, 2026, at Art Hill in Forest Park, St. Louis. Brian Munoz/St. Louis Public Radio hide caption

President Donald Trump, and first lady Melania Trump arrive at an observance ceremony on the 25th anniversary of the 9/11 attacks, Friday, Sept. 11, 2026, at the Pentagon. Mark Schiefelbein/AP hide caption

Matt Dunleavy and his daughter Ellie Dunleavy take part in a ceremony commemorating the 25th anniversary of the Sept. 11, 2001, attacks at the National September 11 Memorial in New York City on Friday. Jeenah Moon/Reuters Pool via AP hide caption

Brooks Penny, 9, Harper Penny, 12, Mabrey Penny, 11, Isla Penny, 6, Charlotte Zwolinski, 6, Kensie Zwolinski, 9, and Madelyn Zwolinski, 4, holds their posters up for the Austin fire fighters during the annual Austin Fire Department Memorial Stair Climb at Pleasant Valley Tower on Friday. Austin firefighters climbed the tower until they reached 1,386 feet, the height of the World Trade Center, to pay tribute to firefighters who died on 9/11. Patricia Lim/KUT News hide caption

Austin firefighters enter the Pleasant Valley Tower during the annual Austin Fire Department Memorial Stair Climb on Friday. Patricia Lim/KUT News hide caption

Suzi Mahe, a 66-year-old volunteer from University City, Mo., adjusts a portrait honoring Army Cpl. Jonathan Schiller of Iowa at the "Flags of Valor" installation on Thursday, Sept. 10, 2026, at Art Hill in Forest Park, St. Louis. More than 7,600 American flags honor service members, first responders and civilians who died in the Sept. 11th attacks and subsequent military conflicts. Brian Munoz/St. Louis Public Radio hide caption

Members of the Chicago Fire Department commemorate the 25th anniversary of the Sept. 11, 2001, terrorist attacks during a ceremony at Navy Pier, Friday, Sept. 11, 2026. Ashlee Rezin/Sun-Times hide caption

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