Recent riot in HMP Birmingham is highly likely to cost more than £2 million.
All the locks will be replaced at the prison following Friday's disturbances.
A bunch of keys taken from a prison officer as the trouble began was recovered but officials remain concerned about the risk of copies being made.
Justice Secretary Liz Truss has said G4S, the private firm which operates the jail, will cover the costs.
Prisons Minister Sam Gyimah visited the prison on Wednesday and met staff who were on duty at the time of the 12-hour riot.
Stairwells were set on fire and paper records destroyed during the trouble in four wings of the category B prison.
More than 460 prisoners have been moved out of the prison since the riot.
The disorder came months after a report by the Independent Monitoring Board said staff were concerned inmates were taking substances which can make them violent.
Asked how substances were getting into the prison, Jerry Petherick, managing director of custodial and detention services at G4S, said "a very small minority of staff are corrupt".
0 comments: