Syrian Observatory for Human Rights said the strike hit part of the Saeqa military camp near the town of Ayyash in western Deir al Zor province.

An air strike believed to have been carried out by the U.S.-led coalition killed at least three Syrian military personnel in Deir al Zor province, which is mostly held by ISIS, the Syrian Observatory for Human Rights monitoring group said on Monday.

A source close to the Syrian government confirmed the strike and said there had been casualties and vehicles destroyed.

It would be the first time coalition warplanes had hit Syrian government forces.

The Observatory said the strike hit part of the Saeqa military camp near the town of Ayyash in western Deir al Zor province and wounded 14 military personnel in the first such incident since the coalition began its bombing campaign against Islamic State in Syria.

The U.S.-led force’s campaign is against ISIS, which controls most of Deir al Zor, including its capital, and has regularly targeted the group in the eastern Syrian province.

In Deir al Zor city, another air strike believed to be carried out by the coalition killed a woman and two of her children, the Observatory said.

Deir al Zor province links ISIS’ de facto capital in Raqqa with territory controlled by the group in Iraq, and its oilfields are a major source of revenue for the group.

Related articles across the web

• Syrian army uses new Russian jets to strike Islamic State - monitor
• Syria air strikes on Palmyra force hundred's to flee
• Syria crisis: 'Deadly air raids' against IS in Palmyra
• Syria 'launches air raids on Palmyra'
• Syria 'launches air raids on Palmyra'
• Syrian army uses new Russian jets to strike ISIS in Aleppo
• Syrian army uses new Russian jets to strike Islamic State
• Syrian army uses new Russian jets to strike Islamic State - monitor
• Syrian jets pound Islamic State-held Palmyra
• ISIS battered by Assad's airstrikes