Counter-terrorism officers have been brought in to investigate an attack on two prison officers at a maximum security jail.
A male warder was left with a broken cheekbone after being held hostage by three male prisoners, two aged 25 and one aged 26, while a female prison officer received minor injuries as she attempted to help her colleague.
The North East Counter Terrorism Unit (CTU) has been called in to lead the investigation into the incident at HMP Full Sutton in Yorkshire.
A statement from the unit said: "Inquiries are ongoing to establish the circumstances surrounding the incident. Given the potential nature of the incident and the range of skills and expertise within the North East CTU, the unit is leading the investigation at this time."
Both prison officers have received treatment for their injuries and have since been discharged.
More top news
Lucy Beale's killer will be revealed live on air during a special week of EastEnders episodes to mark the soap's 30th anniversary.
Spandau Ballet reunited on stage for the first time in five years as the band performed at the premiere of a film documenting their career.
From tomorrow, tax discs will no longer be needed to show drivers have paid their vehicle tax. Richard Pallot reports on the end of an era.