The PSNI are assisting An Garda Síochána in the appeal to help locate a missing person.
38-year-old George Brennan is missing from Co Mayo, according to the police.
In a social media appeal, Police Causeway Coast & Glens added: "George may have links to the Causeway Coast and Glens area, and also the Mid and East Antrim area.
"If anyone has any information relating to George, please contact police on 101, quoting reference number 831 of 28/03/2025."
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