The US has carried out air strikes against Iran-linked groups in eastern Syria after a drone attack killed a US contractor, the US defence chief said.
Fourteen pro-Iran fighters were killed, according to a monitoring group.
US officials said the air strikes happened on Thursday night, hours after the drone attack, which US intelligence said was "of Iranian origin".
US bases in north-east Syria have come under attack before, with the US responding with air strikes.
Last August, the US bombed sites in eastern Syria which it said were linked to Iran's Islamic Revolution Guard Corps (IRGC) - its most powerful armed force - after rocket attacks on US troops there.
Thursday night's air strikes were carried out on President Biden's orders "in response to... [the drone] attack as well as a series of recent attacks against coalition forces in Syria by groups affiliated with the IRGC", US Secretary of Defence Lloyd Austin said.
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