A review has been launched at Rimutaka prison after one staff member was allegedly seriously assaulted and another injured by two prisoners.
Prison director Viv Whelan told the Herald both prisoners will be charged with misconduct and have been placed on directed segregation.
"Staff responded immediately and did an excellent job of providing first aid. The injured staff member was taken to hospital and has since returned home to recover."
The second staff member who rushed in to help received minor injuries.