Police are appealing for information following a "disorder event" in Rotorua early on Sunday morning.
Rotorua field crime manager Inspector Lindsay Pilbrow said officers were called to Tania Crescent in Western Heights at around 2:30am.
Pilbrow said on arrival police established there were multiple areas where activity had taken place and a number of injured people who had been assaulted.
He said three people were transported to hospital with serious injuries sustained from the incident. One remains in hospital.