A rebel attack on Aleppo has left dozens suffering of breathing problems and blurred vision, with a smell of gas reported over the city, according to Syrian media. Officials said all of the victims were civilians. At least 50 people have been treated for symptoms including breathing difficulties and blurred vision in Aleppo, after rebels fired shells into two regions of the city. Syrian officials and residents suspect the shells contained poisonous gas, with symptoms suggesting chlorine, according to medical official Haj Taha. A doctor told Syrian state TV on Saturday that at least two people, including one child, were in critical...