US aircraft carried out rare, retaliatory strikes in Syria's Deir al-Zor province on Wednesday against forces loyal to Syrian President Bashar al-Assad after they attacked US-backed fighters' headquarters there, US officials said.
US strikes pro-Syrian forces after 'unprovoked attack' on partners' base
"Syrian pro-regime forces initiated an unprovoked attack against well-established Syrian Democratic Forces headquarters Feb. 7," the statement said.
It said the incident took place 8 km (5 miles) east of the Euphrates River.
"In defence of coalition and partner forces, the coalition conducted strikes against attacking forces to repel the act of aggression against partners engaged in the Global Coalition's defeat-Daesh mission," the statement said, using an Arab acronym for Islamic State.
The Syrian army is backed by Iranian-backed militias and Russian forces. The U.S.-led coalition did not say whether any pro-Syrian fighters were killed in the retaliatory strike.