Air strikes killed 31 civilians including 12 children in the rebel-held Eastern Ghouta region near Syria's capital Damascus on Wednesday, the Syrian Observatory for Human Rights said.
Regime air strikes killed 28 civilians in a rebel enclave near Damascus on Monday as Syria's seven-year-old conflict raged on several fronts with non-combatants paying a heavy price.
Syrian regime and Russian air strikes on Sunday killed 57 civilians, among them 19 children, in rebel-held Eastern Ghouta region and in a village held by the Islamic State group in Syria's eastern Deir Ezzor province, a monitor said.
The deaths were the result of the latest bout in an escalating cycle of tit-for-tat attacks between regime forces and the rebels holding the enclave on the Syrian capital's eastern outskirts.
The Syrian army backed by Russian jets on Wednesday stepped up shelling and air strikes on a besieged rebel-held enclave in Damascus a day after rebels stormed an army base in the area, rebels, a war monitor and residents said.
Dozens of trucks carrying aid for 40,000 people on Monday entered the besieged rebel-held Eastern Ghouta area near Damascus, where residents and relief groups have warned a humanitarian crisis is escalating.
Three suicide bombers blew themselves up near the main police headquarters building in Syria's capital Damascus on Wednesday, killing at least two people, the interior ministry said.
A double suicide bomb attack hit a police station in Syria's capital Damascus on Monday, state media said, with a monitor saying at least 11 people were killed.
Russia's foreign ministry said Wednesday that its embassy compound in Damascus came under mortar fire from "terrorist groups of fighters", causing no casualties.