A Syrian rebel poses in front of a vandalised mural depicting Syrian President Bashar al-Assad (R), his late father and predecessor Hafez al-Assad (C) and his late brother Bassel al-Assad in the northern city of Aleppo on August 3. UN chief Ban Ki-moon warned world powers they must overcome their rivalries to put an end to the "proxy war" in Syria, as deadly fighting raged in Damascus and Aleppo
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