Police are examining CCTV footage before laying charges after inmates were stabbed at Paremoremo Prison in Auckland yesterday.
None of those involved, including the victims, would speak with the police.
One of four alleged offenders, aged between 19 and 37, has been put in isolation after three prisoners were attacked with homemade weapons, Detective James Bolton said today.
A 19-year-old is recovering in Auckland Hospital after he was operated on last night for a punctured lung. He was taken to hospital in a serious condition but is expected to make a full recovery, Bolton said.
Two other inmates at the maximum security prison were treated for minor injuries.
It's understood a brawl erupted between young Black Power and Nomads gang members while prisoners were walking on the landing between cells about 10.30am.
Investigators were now reviewing CCTV footage taken during the attack, and speaking with staff to find out what happened.
But it could be several days before any charges are laid, Bolton said.
"At this stage the four offenders and three victims are refusing to speak with police," he said.
- Fairfax Media