Two U.S. Army soldiers and a U.S. civilian who was serving as an interpreter were killed after shots were fired at U.S. and Syrian forces on a mission to a historic central town in Syria on Saturday, U.S. military officials said. President Trump said Sunday that there will be a "very serious retaliation" after the attack, which he attributed to the Islamic State.

"This was an ISIS attack against the U.S., and Syria, in a very dangerous part of Syria, that is not fully controlled by them," Mr. Trump said in a post on Truth Social on Saturday. "The President of Syria, Ahmed al-Sharaa, is extremely angry and disturbed by this attack. There will be very serious retaliation."

Pentagon spokesman Sean Parnell said in a post on X that the attack occurred as the soldiers were conducting a "k

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