BEIRUT/NEW YORK Syria announced a new offensive against rebel-held areas of Aleppo on Thursday while diplomats failed to find a way in New York to revive a U.S. and Russian-brokered ceasefire that collapsed this week.
Warplanes mounted the heaviest air strikes in months against rebel-held districts of Syria's commercial hub and largest city, dealing a fresh blow to efforts to end Syrian civil war that has raged since 2011.
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