The Observatory, which monitors the Syrian conflict through a network of monitors on the ground, also said the number of people killed in the town of Adra, northeast of Damascus, has risen to 32 after a rebel faction attacked on Wednesday.
Abdurrahman said the dead were primarily members of President Bashar al-Assad's minority Alawite sect, as well as a few Druse and Shia Muslims. All three sects largely support Assad in the fight against the mainly Sunni rebels.
Meanwhile, United Nations officials visited Damascus to discuss how to help Syrians survive winter, and the first United Nations aid flight from Iraq to Syria took off on Sunday after being delayed for several days due to bad weather.
The U.N. aid plane was expected to arrive in Qamishli in northeastern Syria, according to Abeer Etefa, senior Middle East spokeswoman for the U.N. World Food Program.
Laurent Fabius, foreign minister of France, spoke of his concern for the Syrian people during a World Policy Conference in Monaco on Saturday, saying he doubted the peace conference planned for Geneva next month would take place.
He warned that a failure to hold the meeting could mean more suffering for Syrians.
Al Jazeera and wire services