KIEV — Ukrainian forces clashed with pro-Russian separatists in Mariupol on Friday at the port town's police headquarters and at the local interior ministry building, killing eight people and wounding others, Interfax-Ukraine news agency reported.

The news agency said police were trying to wrest back control of the police building when they came under fire from pro-Russians who had taken the interior ministry building.

Local police in the eastern Donetsk region, center of a pro-Russian rebellion against Kiev, said they could not comment.

Tetyana Ignatchenko, a journalist in Mariupol, said there was fierce fighting outside the police headquarters which pro-Russian rebels had seized. She said there was one dead and six wounded on the rebel side.

Ukrainian forces had brought had brought several armored cars into the town, a major industrial and shipping center with a population of about half a million.