A young college graduate filmed the World Trade Center attack from the fire escape of her Chinatown apartment. For many years, she avoided looking at the footage.

© Todd Heisler/The New York Times

President Trump originally intended to commemorate the 25th anniversary of Sept. 11 with remarks at ground zero, but the memorial’s organizers do not allow speeches. Mr. Trump changed his plans.

© Vincent Alban/The New York Times