Five people were injured when a grenade exploded in the Sosenka recreation park in the Alexandrov district of Russia's Vladimir Oblast, said Anna Kuznetsova, the head of the Alexandrov district administration, Report informs via TASS.
According to local media, one of the locals threw a grenade at the park during an argument with cleaning workers.
A man suspected of throwing a grenade has been detained, and an investigation is underway.