A Corrections officer has complained to police after he was allegedly assaulted by a colleague in front of inmates at Rolleston Prison.
The Press has previously reported the prison's medium-security Kowhai Unit was locked down after a fight erupted in the control room on January 3.
A source said the fight began after a junior officer gave inmates milk, and was allegedly punched in the face by one of his superiors.
The two Corrections officers were stood down pending an internal investigation into the incident, Rolleston Prison manager Mike Howson said at the time.
Yesterday, a police spokesman confirmed police were now investigating an assault complaint in connection with the incident.
Last year, The Press revealed a long-serving Corrections officer at Christchurch Men's Prison resigned after being confronted with accusations of corruption.
Corrections investigated allegations he smuggled contraband into the prison in exchange for cash or other items of value. A complaint was later made to police but they have yet to lay charges.
The Kowhai Unit is a 60-bed medium secure unit for inmates at Rolleston Prison with serious drug and alcohol abuse and dependency problems.
- The Press