Air strike targets US-backed SDF near Syria’s Deir Az Zor

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Soldiers from the US-backed Syrian opposition forces have been killed in air strikes near Deir Az Zor.
It was not clear who carried out the strikes.
Syrian Democratic Force (SDF) fighters have been trying to drive ISIL out of the area with the help of US weapons.
Al Jazeera’s Osama Bin Javaid explians.
http://www.aljazeera.com

Air strike targets US-backed SDF near Syria’s Deir Az Zor