Gardaí are investigating an alleged assault at a premises in Killarney.
The incident occurred in the early hours of yesterday morning.
A man in his 40s is currently receiving treatment at Cork University Hospital for serious injuries.
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A second man, also in his 40s, was arrested and has since been released without charge.
A file will be prepared for the Director of Public Prosecutions.
Gardaí say investigations are ongoing.
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