Kilkenny Gardaí are checking CCTV footage from John Street after a man was attacked in the early hours of Sunday morning.
The American man, who was one of the visiting artists for the inaugural Kilkenny Animated festival had his arm broken after he was punched and knocked to the ground in an unprovoked assault.
It happened somewhere between Langtons and the RiverCourt hotel at around 2.30am on Sunday morning.
Anyone who might have witnessed the incident is asked to contact Kilkenny Garda station on 056 7775000.