Gardaí in Dungarvan are investigating the incident which happened on Barrack Street in Tallow shortly after midnight on Wednesday, November 2nd.
A man in his mid-20s sustained very serious injuries and has been taken to Cork University Hospital for treatment.
The scene near the post office has been cordoned off for a technical examination.
Gardaí are particularly appealing to anyone who was in the area at the time of the assault or anyone who might have been travelling on the midnight bus from Lismore to Tallow to contact Gardaí.
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Dungarvan Garda Station can be reached on 058 48600.
