Third night of riots at prison complex near Doncaster
More than 160 inmates have been moved to other jails following a third night of rioting at a prison complex in South Yorkshire.
Prisoners rioted in the adult section at Moorland prison, near Doncaster, following disturbances in an adjacent young offenders' unit on Tuesday and Wednesday.
The disturbance was quelled by teams of prison officers in riot gear.
One prisoner was injured and was taken to hospital for treatment.
A Prison Service spokeswoman said trouble flared in the adult wing at 1830 GMT on Thursday when up to 100 prisoners started throwing objects, causing serious damage.
Prison Service Tornado teams in riot gear arrived at the prison and intervened at 0100 GMT Friday. Twenty-five minutes later all prisoners had surrendered.
A total of 166 prisoners have been transferred to prisons across the country, with another 30 waiting to be moved. More than 80 prisoners had already been moved following the disturbances earlier in the week.
Prison Officers Association (POA) spokesman Glyn Travis said: "Apparently the juveniles and young offenders were locked up and the adults were allowed to come out, and when they refused to go back to their cells it all kicked off.
"Why the hell they let the adult prisoners out in an establishment that is so volatile is beyond me."
Prison Service chief executive Michael Spurr said: "We are now conducting a high-level investigation into these events.
"Staff have done a magnificent job over the past 72 hours. We have deployed additional staff today to Moorland to ensure stability at the prison."
Disturbances initially broke out at the Moorland Young Offenders Institution on Tuesday and Wednesday.
Wednesday night's incident at the young offenders' unit started when about 55 prisoners refused to return to their cells at 1830 GMT.
They surrendered more than eight hours later after the Tornado teams were called in.
One inmate was taken to hospital with head injuries but no prison officers were injured.
On Tuesday night, three members of staff at the prison were assaulted and a female officer sustained a fractured jaw when more than 40 young offenders refused to return to their cells after a fight broke out at 1900 GMT.
The rioting at Moorland on Tuesday happened at the same time as about 60 offenders aged between 15 and 18 refused to return to their cells at Warren Hill in Woodbridge, Suffolk.
The last inspection of Moorland, carried out in October 2008, found "neither the physical environment nor staff-prisoner relationships were sufficiently good".