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Tens of thousands of detainees are held by the government at any one time, and thousands more have "disappeared," the report said.
The assault around Aleppo, which aid workers have said could soon fall to government forces, helped to torpedo Syrian peace talks in Geneva this week.
The resolution makes no mention of the future role of Syrian President Bashar Assad.
WHAT'S HAPPENING
An expert on international law explains why Russia's argument doesn't hold up.
They gave the U.S. a one-hour heads up.
A United Nations speech delivered with love from one tyrant to another.
Violence and instability have devastated the country.