Syrian planes shelled areas at the outskirts of the capital Damascus on Sunday, activists said, on the third day of a ceasefire marking the four-day Muslim festival of Eid al-Adha, dpa reported.
Government forces carried three air raids on the Damascus suburbs of Arbeen, Zamalka and Harasta. Black smoke was also seen in the Ghoutta region, the Syrian Observatory for Human Rights reported.
The opposition group also reported clashes between troops loyal to President Bashar al-Assad and rebels in the northern areas of Aleppo and Idlib.
At least 120 people were killed on Saturday, the observatory said, heightening concerns that the truce brokered by international peace envoy Lakhdar Brahimi is collapsing.
The Syrian army and rebel fighters have blamed each other for violating the ceasefire, which Brahimi had hoped would clear the way for a political solution to the country's 20-month conflict.