Prison officers have been injured after 80 prisoners have attacked the with pool balls at the high-security HMP Long Lartin
A source said staff at HMP Long Lartin in Worcestershire had retreated from E wing after inmates became violent.
Ten “tornado teams” of Prison riot officers have been sent to the prison.
The Ministry of Justice (MoJ) said: “We are currently managing an ongoing incident at HMP Long Lartin.”
“We are absolutely clear that offenders who behave in this way will be punished and face spending extra time behind bars,” the statement added.
There have previously been serious violence in local and training prisons, but to have a disturbance like this at a high-security jail would cause alarm at the MoJ.
It is understood that Staff on E wing had retreated and it had been secured, so the troublemakers could not go elsewhere.
There is also believed to be a separate protest elsewhere in the jail
The prison is one of the highest-security prisons in England and Wales most of
the inmates are serving life sentences.
Normally the higher staffing ratios and older age of the prisoners means you get less trouble.
Long Lartin has suffered cuts and has lost a fifth of its staff.
They are recruiting, but tonight it’s a prison on the edge.
HMP Long Lartin is a maximum security jail which also holds category A prisoners awaiting trial.
The category A men’s prison has a capacity of 622 inmates.