Beirut (AFP) - Military and political opposition forces in Aleppo on Sunday rejected UN envoy Staffan de Mistura's proposal of a temporary ceasefire in the northern Syrian city.

"We refuse to meet with Mr Staffan de Mistura if it is not on the basis of a comprehensive solution to Syria's drama through the exit of (President) Bashar al-Assad and his chief of staff, and the prosecution of war criminals," Aleppo's revolutionary council said in a statement.