Police are investigating an incident involving three prisoners at HMP Full Sutton in Yorkshire.
A Ministry of Justice spokesman said: "An incident involving three prisoners took place at HMP Full Sutton on 26 May from 4.25pm and was successfully resolved at 8.40pm after staff intervened.
"A police investigation is ongoing."
More top news
China's wild Panda population grew by 268 or 16.8% between 2003 and 2013 according to a nationwide survey on the highly endangered mammal.
Approaching Atlantic frontal systems will give a wet and windy night right across the UK with some heavy bursts of rain for everyone.
Police said 375 people attended a rally in Newcastle by the anti-Islam group Pegida, while 2000 people joined a counter-demonstration.