Six inmates have been arrested after a disturbance at a prison in Cumbria.
Haverigg prison holds more than 560 inmates
The Prison Service confirmed there had been six hours of "indiscipline" at Haverigg Prison overnight.
The disturbance, details of which have not been released, began on Thursday evening when a number of prisoners refused to return to their rooms.
The prison - a former RAF base near Millom - holds 568 Category C male prisoners, who are kept in cellular house blocks and billets.
Negotiators were called in for a time to speak to those involved in the disturbance.
A spokesman for Cumbria Police said six inmates were in custody after the incident.
He said the prison was now working as normal.
A HM Prison Service spokeswoman added: "We can confirm an incident of concerted indiscipline at HMP Haverigg.
"We believe only a small number of inmates are involved."