The victim was at the Town House on Friday night, when the incident occurred shortly after midnight.
It’s been reported that at around 00:30 on Saturday 29 December, there was an incident involving a man wearing a white t-shirt, who was punched in the face by another man, leaving the victim with the broken nose.
PC 145 Kershaw is investigating, and any witnesses can contact him on 725111 or via Crimestoppers anonymously on 0800 555 111.
Pictured: Guernsey Police Station.