Three Auckland Prison guards have been charged following an incident in which they were allegedly attacked by inmates.
Inspector Sunny Patel said police had been investigating an incident at the prison on 20 May, in which inmates allegedly attacked guards, with one officer being stabbed multiple times.
Three prisoners were jointly charged with intent to cause grievous bodily harm and aggravated assault after the attack.
Police said due to injuries received by the prisoners, and because of concerns raised by Corrections, they had also investigated the force used by the prison officers involved.
Assault charges have been laid against two officers, with one 34-year-old man facing a grievous bodily harm charge and a 26-year-old man facing an assault charge.
A 31-year-old man has also been charged with attempting to pervert the course of justice.
The officers are due to appear in the North Shore District Court tomorrow morning.
In a statement, Auckland Prison director Andy Langley said three staff members had been suspended following the incident.
Mr Langley said he reported the incident to police immediately after it happened and also made changes to the management of the prison wing where the attack took place.
A Corrections inspectorate report into the incident is under way, alongside a full operational review, he said.