The Syrian army on Saturday (August 11th) shelled the Salaheddine district of Aleppo, AFP reported.
The Free Syrian Army staged a withdrawal from the district on Thursday, but opposition commanders said their forces are still putting up resistance there.
"Fierce fighting has continued without respite for the past 24 hours as the army tries to push us out of the neighbourhood," opposition commander Abdel Qader Saleh told AFP.
Regime forces on Saturday also shelled the eastern Aleppo district of Sayf al-Dawla, the western neighbourhoods of Bustan al-Qasr and Masharaqa, and the Malak district, where one opposition fighter was killed, the Syrian Observatory for Human Rights reported.
Meanwhile, two bombs exploded on Saturday in the heart of Damascus, state television said, without reporting casualties.
Gunfire was reported on Baghdad Street in central Damascus and clashes between opposition and government forces were reported elsewhere in the capital, including Tadamun and Qadam.
The renewed violence came as at least 39 people, including 20 civilians, were killed in violence across the country, the Observatory said.