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.''