Several inmates have been moved out of Winchester Prison after a violent disturbance.
A female nurse is reported to have been attacked in the incident.
It is understood that she was taken to hospital with minor injuries but is now back at work at the jail, which houses many prisoners and remand inmates from the Portsmouth area.
A Prison Service spokesman confirmed today: “A number of prisoners were involved in an incident at HMP Winchester on Sunday.
‘This was quickly resolved by staff and all prisoners responsible have been moved to other prisons. The police are also conducting an investigation.
‘We do not tolerate violence in our prisons. Those responsible for violence face spending longer behind bars.’