Prisoner arrested over death of fellow inmate

A prisoner serving a life sentence for murder has been arrested on suspicion of killing a fellow inmate at a jail in Buckinghamshire.

Robert Coello, a 44-year-old convicted paedophile, was found in his cell at Grendon prison on Sunday with head injuries. He later died in hospital, the Ministry of Justice said. It was reported that he had been stamped to death.

A 25-year-old inmate, convicted of murder, was arrested by Thames Valley Police and later returned to prison on bail. It is thought that he has only been at Grendon for six months.

The murder is the first to occur at the prison in its almost 50-year history. Opened in 1962, it is the country's only therapeutic prison and specialises in taking category B and C offenders who are suffering from antisocial personality disorders. It is unique in the fact that prisoners must choose to go to Grendon and cannot be sent there without their consent.

The murder has prompted the Prison Officers' Association (POA) to suggest that the type of offender sent to Grendon should be reviewed. The POA claims that budget cuts have compromised security and vetting procedures at the prison.