A woman (50s), one male teen and two men (20s and 30s) were arrested on Tuesday in connection with an investigation into the discovery of the body of a man in Bray, Co Wicklow in January.
The four individuals are currently detained under Section 4 of the Criminal Justice Act 1984 at a garda station in the Wexford/Wicklow Division.
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Gardaí said they are continuing to investigate all circumstances surrounding the death of the man following an incident in Bray on Sunday, January 19th.
Investigations are ongoing, they said.