President Donald Trump vowed retaliation Saturday after two U.S. Army soldiers and a civilian U.S. interpreter were killed in an attack in Syria, an incident the Pentagon said occurred during a counterterrorism engagement.

"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," Trump said on Truth Social . "There will be very serious retaliation."

Three other U.S. personnel were wounded in the attack in Palmyra, Sean Parnell, the Pentagon’s chief spokesperson said on X. The attack occurred as the soldiers "were conducting a key leader engagement" in "support of ongoing counter-ISIS operations," he said.

"This attack is currently under active investigation," Parnell said.

U.S. Central Command said the attack was

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