A Times analysis of footage released by the F.B.I. on Thursday night appears to show the assailant shot at a Secret Service officer, who then returned fire.

Iranian state media posted mangled remnants it claims were from the Feb. 28 attack in Minab. An analysis shows they have the markings of a missile made by American manufacturers

The Feb. 28 school strike in Minab, which killed dozens, including children, appears to have been part of an attack on an adjacent naval base in southern Iran, where officials said U.S. forces were operating.