The U.S. military launched airstrikes on Syrian government-backed troops Wednesday after as many as 500 attackers began what a U.S. military official said appeared to be a coordinated assault on Syrian opposition forces accompanied by U.S. advisers in Deir el-Zour Province.
No U.S. special operations troops were hurt in the attack, officials told Fox News.
The coalition remains committed to focusing on that mission in the Middle Euphrates River Valley and asserts its non-negotiable right to act in self-defense, officials said. Wednesday's incident is the latest of its kind involving the US-supported rebels terrorists and Syrian government forces.
Neither U.S. officials nor the U.S. -backed coalition have offered details on the attacking forces.
A military official, who provided information about the attack on the condition of anonymity because he was not authorized to discuss it on the record, said the attacking forces initiated the assault by lobbing artillery at the SDF and US forces, who were located eight miles east of the Euphrates River.
Some 500 pro-regime troops carried out the attack using artillery, mortar fire and Russian-made tanks, a U.S. military official said.
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"The US military is telling Damascus that it better think long and hard if it wants to go after America's partners", Mr Heras said.
The Syrian army is backed by Iranian-backed militias and Russian forces.
While one member of the Syrian Democratic Forces was injured, no coalition or American personnel were killed.
It's not the first time USA -led forces in the country primarily to hunt ISIS have targeted pro-Assad forces in self-defense.
The US maintains about 2,000 troops in Syria, who mostly work with the over 50,000-strong Syrian Democratic Forces, a mix of Kurdish and Arab fighters who have been the primary US-backed force fighting ISIS in Syria.
Around 2,000 United States troops were reportedly deployed to Syria, according to the Defense Department.