Two American troops and a civilian interpreter were killed in central Syria on Saturday after an alleged member of the Islamic State (IS) group opened fire on a joint US-Syrian patrol, officials said.

"We mourn the loss of three Great American Patriots in Syria," US President Donald Trump said on his Truth Social platform, vowing "very serious retaliation."

Pentagon spokesman Sean Parnell said the attack took place in Palmyra, home to UNESCO-listed ancient ruins and once controlled by the IS group -- also known as ISIS -- during the height of its territorial expansion in Syria.

The deadly attack had been "an ambush by a lone ISIS gunman," who was "engaged and killed," US Central Command said on X.

Trump called it "an ISIS attack against the U.S., and Syria, in a very dangerous part of

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