A man suffered head injuries following an assault in Carrick-on-Suir in the early hours of Sunday morning.
Gardaí are appealing for witnesses to the assault in the Ard Mhuire area of the town, in which a man was assaulted by another male with a weapon.
The victim is receiving treatment at Waterford University Hospital for head injuries.
A man has since been arrested by Gardaí as part of the investigation, and is being questioned at Clonmel Garda Station for Assault Causing Harm.
Carrick-on-Suir Garda Station can be contacted on (051) 642 040.