Paramedics were dispatched to the prison following the attack.
A North East Ambulance Service spokesperson said: “We received a call at 9.23am on Thursday 26 February 2026 to reports of an incident at HM Prison Frankland in County Durham.
“We dispatched two ambulance crews to the scene and requested support from the Great North Air Ambulance Service (GNAAS).
“One patient was transported to hospital by road.”
