Russia says more than 7,000 civilians have left Eastern Ghouta in the past few hours. This comes after a Russian air raid on the besieged Syrian enclave killed 70 people.
Bombs hit a market in the town of Kafar Batna, within rebel-held Eastern Ghouta.
The Syrian government and its allies launched an offensive to capture the area months ago.
Further north, Turkish-led forces are preparing to attack the city of Afrin, where the UN says 48,000 people have been displaced.
Al Jazeera's Alan Fisher reports from the Turkish-Syrian border.