The rebel fighter, who wouldn't give his name because of security concerns, said outside the hospital in Donetsk that 30 bodies of his fellow insurgents were delivered there.
He said the truck carrying the bodies was still parked outside the hospital, waiting for explosives experts to check it for any unexploded ordnance.
Donetsk, a city of 1 million, saw heavy fighting yesterday, when rebels moved to seize the city airport, Ukraine's second largest, and were repelled by government forces, which used combat jets and helicopter gunships.
Officials closed the airport, and police shut nearby streets for traffic. The city mayor went on television advising residents to stay at home.
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Yesterday's battle 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.
Yet Poroshenko described the separatists as "Somali pirates," saying that arms should be used against "killers and terrorists," but he also indicated that he wants a quick end to the military operation in the east.
Poroshenko, known for his pragmatism, supports building strong ties with Europe but also has stressed the importance of mending relations with Moscow.
Upon claiming victory, he said his first step as president would be to visit the east.
He said he hoped Russia would support his efforts to bring stability and that he wanted to hold talks with Moscow. Russia welcomed his intention to engage in talks with people in the east and said it would be ready to work with Poroshenko.