A police officer has been stabbed in the chest at Frankland Prison.
The officer is "conscious and talking" in hospital after the incident this morning, Durham Police said.
He was visiting the Category A men's prison from an outside force.
A spokesman for Durham Police said: "Shortly after 11am this morning, Durham Constabulary were called to an incident at HMP Frankland in Durham City.
"A police officer, who was visiting the facility from an outside force, suffered a stab wound to the chest during the incident.
"The injured officer has been taken to hospital by ambulance, where he is described as being 'conscious and talking'."
The jail holds more than 800 men.
Justice Secretary Shaban Mahmood said: "Deeply concerning news from HMP Frankland today, where a police officer has been stabbed, though is conscious and talking in hospital.
"I am being kept up-to-date with all developments. And my thoughts are with that brave officer."
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