Activists say Syrian air raids on two towns held by Islamic State (IS) militants have killed more than 50 people in two days.
The British-based Syrian Observatory for Human Rights said on December 26 that several airstrikes on the towns of Al-Bab and Qabasin in the northern province of Aleppo killed at least 53 people, including seven children.
The strikes occurred on December 25, said the group, which relies on a network of activists on the ground.
Another Syrian monitoring group also reported the raids, and activists uploaded to social networks what they describe as video footage of the aftermath of the air strikes.
The Syrian government has been heavily bombing areas held by rebels and the IS group in recent days.
Rights groups accuse government forces of using bombs that cannot hit targets precisely, thereby causing high civilian casualties.