hostage, a government minister has said.Police have rushed to the scene in the central city of Poltava, Ukraine.Police on Thursday were trying to arrest a man suspected of hijacking a vehicle when he took out a grenade and threatened to kill one of the officers, Deputy Interior Minister Anton Gerashchenko said on Facebook.After negotiations, the man exchanged the police officer for a police colonel and drove off with him in a car provided by police.An operation to detain the man is under way, officials said.Local reports say the man appears to be driving out of the city, reportedly accompanied by police vehicles."Negotiations are ongoing to force the attacker to surrender to the police without harming himself or others," Gerashchenko.
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