The POA are aware of the attack on two prison officers at HMP Full Sutton.
Until the full facts of the incident are known, we do not wish to speculate or indeed compromise an ongoing police investigation.
We can confirm that officers sustained injuries and, had it not been for the professionalism of prison officers dealing with this violent incident, the outcome could have been worse.
More top news
David Cameron faces a revolt over the EU referendum, as he is accused of "disrespect" for dismissing local party activists' views on Europe.
Dame Helen Mirren was forced to improvise during an awards acceptance speech as mic slips to down to half her height.
The Duchess will carry out her first engagement as Honorary Air Commandant of the Air Cadets after assuming the role in December.