A government tank comes under fire in Douma.
Amateur vide out of Syria which could not be independently verified by Reuters appears to show rebels launching attacks Friday.
Fierce fighting also continues in Aleppo, Syria's largest city
Rights groups say more than 90 people were killed in Syria on Friday alone.
Rebels fire rockets from their strongholds inside Aleppo.
The footage comes amid reports that activists found at least 79 bodies in a town close to Damascus. They say many were young men who appear to have been killed execution style.
What began last March as street protests against the government has now cost the lives of more than 18,000 people.
