At least 20 people were killed across Syria on Wednesday, opposition activists said, as diplomats at the United Nations prepare to debate once again how to respond to the mounting crisis in the country.Twelve people were killed in Wadi Barada, in the Damascus suburbs, according to the Local Coordination Committees of Syria, an opposition group that organizes and documents demonstrations. The other deaths occurred in Homs, Idlib and Qamishli, the LCC said.The latest casualties include six defectors who were killed during clashes with government forces in the Damascus suburbs, according to the Syrian Observatory for Human Rights, another opposition activist group.

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