Opposition activists say Syrian fighter jets have bombarded suburbs of Damascus.

The attack Sunday comes on the third day of what was to be a four-day holiday cease-fire between the government and rebels.

The U.N.-backed truce declared for the Muslim holiday of Eid al-Adha is largely in tatters. It was to begin on Friday, but 150 people were killed in anti-government violence that day. On Saturday, about 50 people were killed. It was not immediately clear how many people were killed in Sunday's shelling around the capital.

U.N. special envoy Lakhdar Brahimi arranged the cease-fire so Syrians on all sides could celebrate Eid al-Adha, the holiday marking the end of the Hajj pilgrimage to Saudi Arabia.