Rotorua police are calling for calm in the wake of a slew of open-invite Facebook parties that turn violent in the area.
They are currently investigating reports of planned vigilante justice for a series of assaults suffered during out-of-control parties early this month.
Six people were taken to hospital on November 9 after disorder in the Pretoria and King Street areas of Rotorua.
Two suffered fractured skulls, while a third received 30 stitches to a facial wound.
Since then, two youths have been charged for retaliation assaults and information has been received by police that more attacks are planned.