This was reported on the official website of the Ukrainian police department in the Kharkiv region.
Among the victims are two adolescents aged 16 and 17 years.
The cause of the incident was a conflict between young people and a man who threw an RGD-5 grenade.
As a result of the explosion, five people were wounded by shrapnel.
All victims were urgently hospitalized.
The police detained the offender - he is charged with attempted murder and illegal handling of weapons, ammunition and explosives.
Earlier it was reported about three wounded as a result of an incident in the Osnovyansky district of Kharkov.