Pro-government forces fired rockets and dropped barrel bombs from helicopters on the towns and villages of the rural district just outside Damascus.
Pro-government forces pounded Syria's eastern Ghouta on Tuesday, killing at least 66 people after the enclave's heaviest one-day death toll in three years, a monitoring group said.
The local government in Afrin accused Turkey of creating a "humanitarian crisis" by killing at least 160 people and displacing tens of thousands since the start of its three-week-old offensive.
The Syrian army and its allies made sweeping advances in Aleppo overnight, subjecting rebels in the city to the heaviest bombardment in days and pushing them to the brink of collapse, state media and a monitoring group said.
Syrian aircraft and artillery pounded rebel-held areas of Aleppo early Friday as Damascus and its ally Moscow intensified a renewed offensive against the rebels.