Syrian and Russian warplanes have launched a wave of air strikes in northern Syria, killing dozens in areas held by a rebel alliance battling to take control of second city Aleppo.
At least 24 Islamic State group fighters and eight civilians were killed in air strikes Sunday on Syria's Raqqa, the de facto capital of IS, a monitor said.
Russian warplanes carried out intense air strikes on rebel strongholds in Syria on Friday hours before a ceasefire is due to come into force, the Syrian Observatory for Human Rights monitor said.
Thousands of Syrians were braving cold and rain at the Turkish border on Saturday after fleeing a Russian-backed regime assault on Aleppo in northern Syria that threatens a fresh humanitarian disaster.
