A 22-year-old man has been arrested by police investigating the murder of County Down woman Lisa Dorrian.
Lisa Dorrian's body has never been found
Lisa, 25, disappeared after attending a party at a caravan site in Ballyhalbert on 28 February. Despite extensive searches her body has never been found.
The police are looking at the possible involvement of members of the Loyalist Volunteer Force in her killing.
Last month, Prime Minister Tony Blair pledged his support in helping to locate the Bangor woman's body.
The case was brought to his attention following a meeting with the Ulster Unionist Party.
It was hoped the remit of a forensic expert being brought in to investigate the cases of the Disappeared would be extended to include Miss Dorrian.
In June, the British and Irish governments said the expert would be funded to help find the remains of five people abducted, murdered and secretly buried by the IRA during the Troubles.
The Irish government said it had no problem with the scientist's remit being widened to include the search for Miss Dorrian.
Her family have already offered a £10,000 reward for information leading to the recovery of her body.