Syria's government has welcomed any initiative for talks to end bloodshed in the country, after UN-Arab League envoy Lakhdar Brahimi said he had a peace plan acceptable to world powers.
On Monday, dozens of tortured bodies were found in a flashpoint district of the capital, a watchdog reported, in one of the worst atrocities in Syria's 21-month conflict.
"Thirty bodies were found in the Barzeh district. They bore signs of torture and have so far not been identified," said the Britain-based Syrian Observatory for Human Rights.
The reports came as a gruesome video emerged on the internet of a separate slaying of three children who had their throats slashed in Jobar district, also in Damascus.
Opposition activists said the children had been kidnapped the day before at a checkpoint on their way home from school.
These reports could not be verified independently because of media restrictions by the Syrian authorities.
Regime warplanes, meanwhile, bombarded rebel positions on the northeastern and southwestern outskirts of Damascus, leaving eight civilians dead including two children, activists said.
Southwest of the capital, fierce fighting erupted in the town of Moadamiyet al-Sham with 11 rebels killed in clashes and a child killed in shelling.
In neighboring Daraya, rebels destroyed a tank as army reinforcements massed in the battleground town, where more than 500 people were reportedly killed in the conflict's bloodiest massacre in August.
In the north, eight civilians, four of them children, were killed in shelling in the Marjeh district of Syria's second city Aleppo.
Syrian television reported the army was "clearing Aleppo of terrorists".
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Aljazeera