Detectives investigating the murder of Co Down woman Lisa Dorrian have arrested an 18-year-old man in the greater Belfast area.
The 25-year-old disappeared after attending a party at a caravan site at Ballyhalbert in Co Down at the end of February. Her body has never been found despite extensive searches.
Detectives have been examining the possible involvement
of members of the Loyalist Volunteer Force.
On Sunday, her family marked her 26th birthday by releasing 26 white balloons over the seafront in Bangor.
The family said they were no closer to finding out what happened to her. They have offered a £10,000 reward for information leading to the recovery of her body.
Three men have already been questioned about the killing but were later released.
