US-led air strikes killed at least 120 jihadists in Syria on Tuesday, a monitoring group said.

The dead included more than 70 members of the Islamic State (IS) group in the north and east of Syria, as well as 50 Al-Qaeda militants, according to the Britain-based Syrian Observatory for Human Rights.

Eight civilians, among them three children, were killed in US strikes in the west of northern Aleppo province, the Observatory said.

The group said at least 300 people were injured in the strikes, about 100 of whom were in serious condition.