Regime forces shelled areas in the south of Damascus on Wednesday, including the Yarmuk camp, while warplanes bombed areas in the north and centre of the country, the Syrian Observatory for Human Rights said.
"The Al-Hajar al-Aswad neighbourhood of Damascus was shelled by regime forces," the watchdog said, adding that other southern neighbourhoods, including the Yarmuk Palestinian refugee camp and Qadam district, were the scene of "fierce fighting between rebel fighters and regime troops overnight."
Around the capital, the group also reported fighting in the Daraya neighbourhood, which regime forces have been trying to retake.
South of Damascus, the Observatory said regime forces were also shelling Beit Jan in the Syrian-held part of the Golan Heights, which is mostly occupied by Israel.
The group also reported regime air raids in Raqa province in the north, where rebels forces seized control of Raqa city earlier this month, as well as in the central province of Hama.
In the central city of Homs, the watchdog reported clashes between government troops and rebels in the Baba Amr neighbourhood, after the area was shelled overnight.
According to a toll released by the Britain-based Observatory, 167 people were killed throughout Syria on Tuesday -- 43 regime troops, 56 rebels and 68 civilians.