Prisoners have been moved from a jail following two separate incidents in which inmates were attacked.
Two prisoners were assaulted with a "sharp implement" at Wellingborough Prison, in Northamptonshire, on Wednesday and Friday.
The Home Office said a number of prisoners had been transferred to other establishments "in order to maintain order and security".
In both incidents, those attacked suffered minor injuries.
A Home Office spokesman said: "On 28 June, a prisoner attacked another with a sharp implement.
"The victim of that was treated at hospital for minor injuries and returned to custody on the same day.
"That incident is being investigated by the police and prison authorities."
In the second attack, an inmate suffered minor wounds and was treated in the healthcare centre of the prison.
The jail comprises mainly Category C adult men, serving 18 months and above, with life sentence prisoners by allocation.