Militants reportedly struck in Deir al-Zor on Saturday.
The Syrian Observatory for Human Rights says the number of death is likely to rise.
Coalition strikes have hit the Syrian provinces of Aleppo, Deir al-Zor, Hasaka, Raqqa and Idlib, the Observatory said. BEIRUT
Syrian Forces Kill At Least 63 Civilians In Effort To Crush Friday Protests, Says Human Rights Group
In the southern city of Deraa, where protests first broke out 11 weeks ago, hundreds defied a military curfew and held protests