In 2019-20, there were three serious assaults on officers at the Otago Corrections Facility, as well as 10 non-serious assaults and 21 no-injury assaults. Photo / Greg Bowker, File
A Corrections officer thought they were going to die during a "savage, violent" attack that left four Otago Corrections Facility staff needing hospital treatment.
A review would be carried out following the attack in a high-security unit on Saturday afternoon, prison director Lyndal Miles confirmed.
Two prisoners initially approached two staff in the unit's staff base and began assaulting them, Miles said.
Two other prisoners then joined in the assault as additional unit staff came to assist.
Police were advised of the assault and would determine whether any criminal charges were laid.
She could not provide any further information on the injuries suffered by the staff members for privacy reasons.
Corrections Association vice-president Paul Dennehy said that a colleague who viewed footage of the incident called it a "savage, violent assault".
One of the injured staff members told a colleague they thought they were going to die "because of the sheer brutality of it".
There was concern about one of the officers suffering a concussion, and other injuries to an arm and a nose, Dennehy said.
It was unclear what had sparked the attack, he said.
One of the responding officers managed to use their pepper spray during the incident.
He believed it was the most significant mass-injury assault at the prison since 2017.
The association was engaging with Corrections over the incident and why it occurred.
That would include looking at whether there were any red flags in terms of the prisoners in the unit at the time, and also the security of the staff base.
Figures released to the Otago Daily Times earlier this year showed in the 2019-20 year, there were three serious assaults on Corrections officers at the Otago Corrections Facility, as well as 10 non-serious assaults and 21 no-injury assaults.
Corrections recorded health and safety incidents on a tracker system. That included events involving prisoners, staff and contractors, and tracked any injury incidents, non-injury (near-miss) incidents and events related to uncontrolled hazards.
There were 680 events recorded on the health and safety tracker at the Otago Corrections Facility between January 1 and November 30 last year.