The war monitoring group said it could not immediately confirm who carried out the attack, which took place in Raqqa province where the Daesh militant organisation is still active.
Units of the Syrian army, with logistical support from the Russian army, repelled the most violent attack in recent years by ISIS terrorist militants on military points in the desert of Raqqa Governorate.
Since the morning, Russian fighters launched more than 20 air strikes, targeting sites where ISIS mercenaries are holed up in the Deir ez-Zor Desert, in coincidence with the Damascus government forces sweeping campaigns of mercenaries in separate areas of the Syrian Desert.
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