Updated

An insurgent says 30 bodies of killed fighters have been brought to a hospital following a day of heavy fighting in Donetsk in eastern Ukraine, in which the government forces used combat jets and helicopter gunships against pro-Russia rebels.

A rebel fighter, who wouldn't give his name because of security concerns, said Tuesday outside the hospital in Donetsk that 30 bodies of his fellow insurgents were delivered there.

Monday's battle in Donetsk, a city of 1 million, came just as billionaire candy magnate Petro Poroshenko claimed victory in Sunday's presidential vote. Poroshenko has vowed to negotiate a peaceful end to an insurgency in the east, where rebels have seized government offices and fought Ukrainian troops for more than a month.