Activists say seven members of the same family were killed in an airstrike by the U.S.-led international coalition against the Islamic State group on the northern Syrian village of Arshaf.

The Syrian Observatory for Human Rights, a Britain-based group that monitors the Syria conflict through local observers, says warplanes seen to cross into Syrian airspace from Turkey bombed the IS-held village, killing the seven family members, among them five women and a child.

The Local Coordination Committees activist network says 10 people in the village were killed in the strike.

Recent advances by US-backed Syrian rebels on IS areas in northern Syria have put the extremist group under strain. Arshaf lies just 8 kilometers (5 miles) from the contested town of Marea, north of the city of Aleppo.