At least 20 people, including children, were killed on Wednesday (August 15th) in an airstrike on the town of Aazaz near Syria's northern city of Aleppo, AFP reported.
The attack came amid heavy shelling of several districts of Aleppo.
The Observatory said the strike was by a MiG fighter jet and targeted a former Baath Party headquarters which had been taken over by rebel groups.
"The whole of the area was flattened," Abdel Rahman said. "Those killed included civilians and fighters, but what is clear is that there was a Free Syrian Army base there."