Four prisoners have been injured in an incident at a young offenders prison.
The Ministry of Justice (MoJ) said specially trained officers were sent in to deal with "an incident of indiscipline" at YOI Swinfen Hall near Lichfield in Staffordshire.
The disturbance involved a single wing of the jail.
During the fracas four prisoners received minor injuries but no prison officers were hurt.
A small fire on the wing was dealt with by firefighters.
A Prison Service spokesman said: "Specially trained prison officers dealt with an incident of indiscipline at YOI Swinfen Hall on Thursday.
"The incident was resolved at 00.07 today and the prison is operating as normal."
According to the MoJ website, the jail has an operational capacity of 624 and holds male long-term young adults sentenced from four years to life.