TWO notorious police killers have been charged with stabbing a fellow inmate at a North-East prison, it emerged last night.

Muzzaker Imtiaz Shah and Yusuf Abdillh Jamma are accused of attacking a 22-year-old man at Frankland Prison, in Durham.

The prison has seen several high-profile attacks on prisoners in recent months, although the alleged stabbing is not thought to be linked to any other incident.

Shah, 26, and Jamma, 20, are serving life for murdering PC Sharon Beshenivsky, who was shot dead during a bungled armed robbery of a travel agents in Bradford, West Yorkshire, in November 2005.

She had been a police officer for only nine months and was killed on her daughter's fourth birthday.

Friend and colleague PC Teresa Milburn was also shot, but survived the attack.

At Newcastle Crown Court, Shah and Jamma were told they would be behind bars for at least 35 years.

Durham Police said yesterday that following an incident inside Frankland Prison on the evening of Tuesday, March 6, the two have been charged with wounding with intent.

They are alleged to have stabbed a prisoner from the North-West who is serving life for murder. He was taken to the University Hospital of North Durham for treatment.

Shah and Jamma were arrested, questioned and have been moved to separate prisons.

They are expected to answer their charges before North Durham magistrates next week, via a court-to-prison video link.

Frankland Prison houses about 730 of the country's most feared prisoners and has hit the headlines in recent months.

In July, Dhiren Barot, the leader of a British-based al Qaida cell that plotted to murder thousands of people with "dirty bombs", was injured when fellow prisoners poured boiling liquid over him shortly after he arrived at the prison. Days later, it emerged that the cell of Hussain Osman, one of the failed July 21 suicide bombers, had been set on fire.

Frankland is also home to Omar Kyham, who planned to blow up Kent's Bluewater shopping centre using fertiliser bombs.

Shah, a British Asian who lived in London, was thought to be the leader of the gang which killed PC Beshenivsky. He admitted her murder, along with robbery and firearms offences, and was said by police to be "extremely dangerous, a cunning and evil criminal".

It is believed he was part of Thug Fam - a notorious London gang, and was hand-picked for the armed robbery because of his ruthless nature.

Shah, nicknamed Pesci, was on bail in connection with firearms offences when PC Beshenivsky was killed. He and Faisal Razzaq, who was convicted of the officer's manslaughter, finally admitted the offences in June.

Hassan Razzaq, brother of Faisal Razzaq, was also found guilty of manslaughter of PC Beshenivsky.

Yusuf Jamma, of Small Heath, Birmingham, admitted firing the shot that killed PC Beshenivsky, but claimed it was an accident.

He admitted robbery and was found guilty of murder and firearms offences following an 11- week trial.

Jamma fled his war-torn homeland of Somalia for England in 1993 with his brother, Mustaf Jamma, who was wanted for questioning in connection with PC Beshenivsky's death.