A youth has been questioned following an alleged assault in Bangor city centre at the weekend.
Police found an unconscious man on the High Street at just after 3am on Sunday morning - he was taken for hospital for treatment and later discharged.
A 19 year-old man was later arrested on suspicion of assault and has since been granted conditional bail while an investigation continues.
Detectives are appealing for witnesses to come forward.
District Inspector Jamie Owens said: "I am appealing to anyone who witnessed the incident, or who may have footage of those involved, to contact us."
Anyone with information should contact North Wales Police on 101 or via the live web chat, quoting reference no. O020211.
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