Five Highpoint Prison officers were taken hostage by an inmate wielding a twin-bladed weapon, the BBC has uncovered.
The stand-off at the Stradishall prison on May 12 came the day after a prisoner at Highpoint was taken hostage inside a cell, sources told the BBC.
It is understood that both episodes ended without injury.
On May 11 it is reported that staff found four prisoners barricaded in a cell, one tied up with a sheet over his head.
The prisoners surrendered five hours later.
The incident on May 12 is said to have involved five staff members being taken hostage in an office by a prisoner armed with a weapon who demanded a transfer, to be re-categorised and taken off the prison wing.
Prison Service Gold Command, the national group convened during serious incidents and disturbances, was deployed and the prisoner surrendered, it has been reported.
Suffolk Police have confirmed they were made aware of both incidents.
There will be no further police action in relation to the incident on May 11, which is being dealt with by the prison.
They are, however, investigating the incident on May 12.
A police spokeswoman said: “A prisoner has been produced from the prison and interviewed in connection with the incident and will be dealt with in due course.”
HMP Highpoint is a Category C men’s prison.