A man has been arrested on suspicion of murder following the death of a prisoner at Cloverhill Prison.
The man, aged in his late 30s, died after an “incident” involving another prisoner on Friday night.
Gardaí said they were called to the prison shortly after midnight. The man was treated by emergency services but was pronounced dead a short time later.
A second man was treated for minor injuries.
The State Pathologist Dr Margaret Bolster carried out a postmortem on the man’s remains yesterday.
Gardaí said the results would not be released for operational reasons.
This morning, a man in his 50s was arrested at the prison on suspicion of murder.
He is being held at Clondalkin Garda Station.
Meanwhile, the Irish Prison Service insisted that all practicable measures are being taken to ensure the safety of prison inmates.
It said no prison system can be completely free of violence.
The IPS is also investigating the death along with the Inspector of Prisons.