to undermine the efforts to stop the violence" during the Vienna meeting.
Douma has been a frequent target of government attacks.
"Douma is one of the areas in Syria where there are the highest number of deaths since the beginning of the war," Abdel Rahman said.
Government forces regularly target it with rocket fire, shelling and air raids, and opposition groups in Douma also launch rockets into the capital.
In August, 117 people were killed in a single day of air strikes in the town, causing a global outcry.
Government air strikes there on Thursday hit a market and a hospital, killing at least nine people, the Observatory said.
An AFP photographer said Thursday´s attack had wounded hospital staff, limiting the treatment available for Friday´s wounded.
He said the latest attack as residents gathered at the market left corpses piled on top of each other.
In the chaotic aftermath, a man in his thirties cried over the body of a young boy.
"Since your father was killed in the last massacre, your mother has been telling you to stop working in the market. Why did you go? Why?" he cried. Corrugated metal rooftops, twisted and blown apart in the attack, were left dangling over mangled bicycles and shredded signs.
The Douma Coordination Committee, a local activist group, published a gruesome video of what it said was the aftermath of more than a dozen rockets hitting the market.
Blood-soaked bodies lay crumpled underneath tables, as a young boy in a sky-blue sweater stood on the sidelines, looking stunned.
In Vienna, major powers narrowed their differences on Syria but remained divided over the key issue of Assad´s future, France´s foreign minister said.
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