200 people have been killed across Syria on Thursday , an opposition activist says . Turkey 's prime minister says it is considering plans for a buffer zone in northern Syria . Helicopter gunships fly over Aleppo and Damascus , opposition activists say . ` ` They must stop fighting and killing people now , '' the secretary - general says .
200 people have been killed across Syria on Thursday , an opposition group says . Turkey 's prime minister says it is considering plans for a buffer zone in northern Syria . Helicopter gunships flew over Aleppo and Damascus , opposition activists say . `` They must stop fighting and killing people now , '' U.N. secretary-general says .