Syrian rebels launched an offensive aimed at breaking the government's siege of eastern Aleppo on Sunday, where the U.N. estimates some 300,000 people are trapped with dwindling food and medical supplies.As the powerful, ultraconservative Ahrar al-Sham faction announced the rebels' campaign, residents in the northern city's besieged opposition quarters burned tires to reduce visibility for fighter jets flying overhead, according to local activist Wissam Zarqa.The Britain-based Syrian Observatory for Human Rights, which gathers information from a network of local informants, said rebels and pro-government forces were clashing along several fronts on the outskirts of the divided city. Aleppo was Syria's largest city and its commercial capital before the war.



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