Gareth Morrin was spotted at around 2 am on Thursday morning in the Derry city area.
The 35-year-old is described as being around 5ft 7in tall with short dark hair.
Gareth was last seen wearing a black jacket, blue jeans, white trainers and a black hat with red writing.
A PSNI spokesperson said: “If you know of Gareth’s whereabouts, or have any information please call police on 101, quoting reference number 217 of 17/08/23.”
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