BBCA police officer has been stabbed in the chest at Frankland Prison.
The victim has been rushed to hospital where he is “conscious and talking”.
Police said the officer from another force was attacked at about 11:00 BST while visiting the prison.
This breaking news story is being updated and more details will be published shortly. Please refresh the page for the fullest version.
You can receive Breaking News on a smartphone or tablet via the BBC News App. You can also follow @BBCBreaking on Twitter to get the latest alerts.
