A man in his 60s has been assaulted in Dublin's south inner city.
He was found by gardaí in a flat at the Old Convent on Basin Street at around midday.
The man was taken by ambulance to Beaumont Hospital where his condition is understood to be serious.
A man in his 20s was arrested and is being held at a garda station in the Dublin region.
The scene has been forensically examined.
Anyone with information is being asked to contact Kilmainham Garda Station on 01-6669700 or the Garda Confidential Line on 1800 666 111.
