Detectives investigating the murder of 25-year-old Lisa Dorrian were last night continuing to question a suspect.
According to the PSNI, the 18-year-old man was arrested in the greater Belfast area early yesterday.
Three men have already been questioned about the killing but all have been released.
Ms Dorrian, a shop assistant, disappeared after a party at a caravan site in the coastal village of Ballyhalbert on the Ards peninsula Co Down in the early hours of February 28th. Loyalist paramilitaries have been blamed for her killing.
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Her body has never been found despite extensive air, land, and sea searches and a series of appeals from her family.