The U.S. military provided support in the form of intelligence and combat advice, he said.
Omar Abu Layla, a Europe-based activist from Deir el-Zour who monitors the fighting through contacts there, told the Associated Press that SDF forces have seized control of the oil field but are still clashing with militants in the adjacent housing complex.
The U.S. -backed Syrian Democratic Forces claimed Friday to have taken control of Raqqa.
Syrian government forces and their allies have been fighting for control of Deir Ezzor from the Islamic State since the beginning of * a href="https://newswire.storyful.com/storylines/*/stories/178726" target="_blank" rel="nofollow noopener" *September. Gen. Igor Konashenkov said thousands of civilians were killed in the battle for Raqqa.
"Raqqa has inherited the fate of Dresden in 1945, wiped off the face of the earth by Anglo-American bombardments", he said in a statement.
Syrian authorities don't comment on reports of detentions. He was released in 2000, and was arrested again in 2015 for 17 months.
The Syrian Network for Human Rights, which tracks war detainees and casualties, has documented 85,000 Syrians that have been arbitrarily detained since the conflict began in 2011, 90 percent of them by the Syrian government which doesn't acknowledge their detention.
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McCain's remarks come amid a growing chorus of concern over President Trump's leadership from both sides of the political aisle. Bone spurs are a calcium deposit that causes a bony protrusion on the underside of the heel bone.
US-backed Kurdish and Arab forces say they have captured Syria's largest oil field from ISIS, the latest in a series of recent setbacks for the jihadists in the east of the country.
Syrian government loyalists advancing from the west had reached the outskirts of al-Omar only days before and had seemed poised to take the oil field until the SDF launched its offensive.
The U.S. -led coalition confirmed the SDF had retaken the oil field, and that Syrian government troops were two files away from the fields, located in the oil-rich Deir el-Zour province along the border with Iraq.
The capture of the oil field came five days after the SDF declared victory in the Islamic State's de facto capital, Raqqa, freeing up forces for what is expected to be an intensified effort to drive the militants out of their remaining positions in neighboring Deir al-Zour, said Col. Ryan Dillon, a spokesman for the USA military.
The SDF, with air support from the US -led coalition, said Sunday it captured the Al-Omar field in a "swift and wide military operation".
The surprise assault was meant to leave the militant group no time to sabotage the oil field's infrastructure, as it typically does when retreating from important areas, Dillon said. Its current potential is unknown following a series of strikes on IS-held oil facilities by the US-led coalition.