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Syria says rare US strike an effort ‘to support terrorism’

A photo from the U.S. Air Force of two F-22 Raptor fighter jets as seen from another plane above Syria for Operation Inherent Resolve, Feb. 2, 2018. The American-backed coalition in Syria has repelled an attack by forces supporting the Assad government, carrying out deadly strikes Wednesday night, Feb. 8, 2018, in a rare confrontation between competing factions that have both fought the Islamic State. (Colton Elliott/U.S. Air Force via The New York Times) -- FOR EDITORIAL USE ONLY. --
Colton Elliott/US Air Force via New York Times
The American-backed coalition in Syria repelled an attack by forces supporting the Assad government, carrying out deadly strikes Wednesday night.

BEIRUT — Syrian state-run media said Thursday a rare US strike on government-backed troops in eastern Syria killed and wounded dozens of tribal fighters, calling it a new effort ‘‘to support terrorism.’’

The US-led coalition said its action was in ‘‘self-defense,’’ citing a major attack on its allied forces and US advisers in Deir El-Zour province by at least 500 fighters, battle tanks, howitzers, and mortars.

The overnight attack, which a US military official earlier said killed about 100 of the attackers, added another layer to the Syrian conflict that is once again plunging into a new and unpredictable spiral of violence.

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The attack in Deir El-Zour province in northeastern Syria occurred in crowded battle space. A stronghold of Islamic State militants until late last year, the province also was the group’s main source of oil revenue. US-backed Kurdish-led forces have been fighting for control of Deir El-Zour with rival Russian-backed Syrian troops that are reinforced by Iranian-supported militias.

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The US-backed forces control areas east of the Euphrates River and most of the oil and gas fields, while government forces are based in the west. Previous friction was reported before, but Wednesday’s incident appeared to be the largest since last year. The Islamic State militants have been dispersed in the province, which also has a number of US bases.

In an e-mail Thursday to the Associated Press, Colonel Thomas F. Veale said the coalition reported to the Russians the buildup of the pro-government forces in the area before the attack, and communicated with them during and after it. The Russian officials offered assurances that they would not engage the coalition forces in the area, Veale said.

‘‘Pro-regime forces initiated hostilities with artillery pieces (howitzers). Additionally, Syrian pro-regime forces maneuvered T-55 and T-72 main battle tanks with supporting mortar fire in what appears to be a coordinated attack on Syrian Democratic Forces approximately 8 kilometers (5 miles) east of the Euphrates River de-confliction line in Khusham, Syria,’’ Veale said.

By crossing the river, the pro-government forces would have violated the existing de-confliction agreement between Washington and Moscow, approaching US-backed forces based near an oil field. Russia is the main ally of Syrian President Bashar Assad.

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Asked if Russia was responsible for not stopping the attack, Veale said: ‘‘The de-confliction effort has served its purpose. Just as the coalition does not direct the operations of the SDF, the Russians do not direct operations of the Syrian regime.’’

Veale said they suspect the Syrian pro-government forces were trying to seize terrain from the US-backed forces liberated from Islamic State militants last year, including major oil fields in the area.

The Russian Defense Ministry said the US airstrike wounded 25 pro-Syrian volunteers. It alleged the incident showed that Washington was not interested in fighting Islamic militants but wanted ‘‘to seize and hold Syrian economic assets.’’

Russia’s UN Ambassador Vassily Nebenzia said he will raise the coalition’s airstrike during closed consultations later Thursday in the UN Security Council.

Syria’s state media said the coalition bombed government-backed troops in Khusham, describing them as tribal fighters. The media cited reports of dozens killed and wounded.

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The official state news agency SANA said the local fighters were battling Islamic State militants and the US-backed SDF in the area.

SANA labeled it an ‘‘aggression’’ and a ‘‘new massacre.’’ It later reported that 10 strikes by the coalition had caused ‘‘massive destruction.’’

The head of the SDF unit in the area, Ahmed Abu Khawla, told the AP the attackers were government-backed local militias known as the National Defense Forces. He said they started the attack near oil fields on the east side of the Euphrates.

‘‘It was a little bit stronger than the usual clashes in the area. Everyone is back to their bases,’’ said Abu Khawla, the head of the Deir El-Zour Military Council. ‘‘It is now normal.’’

In Beirut, an official with Hezbollah said the group has no presence in the area hit by the coalition, adding that those who came under fire were pro-Assad forces known as the Popular Committees, as well as the Syrian National Defense Forces. The official spoke on condition of anonymity because he was not authorized to talk to the media.

The Syrian Observatory for Human Rights, which monitors the war, said Deir el-Zour province continues to be tense following the foiled attack and the US response, and said there were reports of a new mobilization to the area.