Two prison guards are recovering from an assault by inmates after an escape attempt at Waikeria Prison in Waikato.
A male and female officer were taken to hospital after they were attacked at about 8.30pm on Saturday.
The Department of Corrections says the guards were assaulted by two prisoners who got out of their cells, with the female officer attacked as she retreated to call for help.
The department says staff responding to the alarm were able to quickly take control of the situation and secure the prisoners.
Department chief executive Ray Smith says he's proud of the two guards, who put themselves at risk to ensure there was no risk to the community.
Both officers were treated for head injuries.
One has been discharged while another remains in hospital for observation.
A police investigation is underway.