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.
Her body has never been found despite extensive air, land, and sea searches and a series of appeals from her family.
