Updated at 19:30
Gardaí have arrested a man in connection with the death of a man who was an inmate at Cloverhill prison in Dublin.
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They were alerted to an incident within the prison shortly after 5:30am in which a man in his 40's was injured.
He received medical treatment but was pronounced dead a short time later.
The man in his 30s is being questioned at a garda station in West Dublin.
The coroner has been notified and the services of the State Pathologist and Garda Technical Bureau have been requested.