Two men who murdered a police officer during an armed robbery have been charged with stabbing a fellow prisoner.
Muzzaker Imtiaz Shah and Yusuf Abdillh Jamma, who were convicted of murdering PC Sharon Beshenivsky in Bradford almost two years ago, have been charged with wounding with intent.
They will go before magistrates next week for the alleged attack on a 22-year-old serving life for murder, who is also an inmate at Durham's Frankland Prison, a maximum security jail.
Durham Police would not officially name the two men who have been charged, but a source confirmed their identities.
The prison attack took place in the alleged victim's cell in March.
The injured inmate, from North West England, suffered wounds to the stomach and cuts to the face.
He received treatment at the University Hospital of North Durham.
Shah and Jamma have been sent to separate prisons.
Their wounding case will be heard next week by North Durham Magistrates, with the defendants appearing via videolink.
The prison houses around 730 of the country's most feared criminals, and there has been a spate of reported inmate-on-inmate attacks.
Last month, Dhiren Barot had to be treated in secret at a Newcastle NHS hospital after he was seriously burnt at Frankland.
The British al Qaida terrorist was understood to have been scalded by another prisoner.
He was jailed for life for plotting to murder thousands of people in dirty bomb attacks.
Days later it emerged the cell of Hussain Osman, one of the July 21 would-be London bombers, had been set on fire at Frankland.
Shah and Jamma were jailed for life and told they must serve a minimum of 35 years each for the police officer's murder.
She had only been a PC for nine months when she was shot outside the Universal Express travel agent in Bradford city centre on her daughter's fourth birthday.
Her colleague, PC Teresa Milburn, was also gunned down in the street and seriously wounded as the robbers escaped with little more than £5,000.
Shah, from Kenton, Greater London, admitted murder but denied firing the shot which killed PC Beshenivsky.
Jamma, from Small Heath, Birmingham, was convicted of murder after he told the court he shot the officer by accident.
His brother Mustaf was thought to be part of the bungled raid and is believed to have fled back to their native Somalia.Reuse content