The bombing occurred on Aug. 26, 2021, as U.S. troops were trying to help Americans and Afghans flee in the chaotic aftermath of the Taliban’s takeover, and compounded America’s sense of defeat after 20 years of war.

“He was a key ISIS-K official directly involved in plotting operations like Abbey Gate, and now is no longer able to plot or conduct attacks,” White House spokesperson John Kirby said in a statement, referring to the Abbey Gate entrance to the Kabul airport where the blast occurred. He did not name the official.

The Afghan affiliate of Islamic State, known as Islamic State Khorasan or ISIS-K, after an old name of the region, is an enemy of the Taliban. Fighters loyal to Islamic State first appeared in eastern Afghanistan in 2014 and later made inroads in other areas.

(Reporting by Idrees Ali and Phil Stewart; Editing by Cynthia Osterman)