Police investigating the disappearance of Bangor woman Lisa Dorrian (25) arrested a man (18) in the Belfast area this morning.
Ms Dorrian has been missing since she left a party at a caravan park in Ballyhalbert on the Ards Peninsula early on February 28th.
Although her body has not been found, despite extensive searches, her family believe she was murdered by loyalist paramilitaries involved in drug dealing.
Three other men have been questioned by PSNI officers over the disappearance but were subsequently released without charge.