Three members of staff at the Paremoremo prison required medical treatment after being assaulted by a group of prisoners yesterday afternoon.

Police were called to Auckland Prison, known widely as Paremoremo, after a report that five prisoners had attacked a small group of workers.

The Department of Corrections confirmed the attack.

"All staff were wearing stab-proof vests and were assessed by medical staff on site,'' northern regional commissioner Jeanette Burns said.

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One of the staff members was taken to hospital.

The other two were taken to an accident and emergency clinic.

"None of the injuries are life-threatening,'' she said.

Police are investigating.

Burns said: "No assault or violence is tolerated in prison. Any prisoner who uses violence will be held to account.''