Detectives were today questioning a man about the murder of a woman who vanished from a caravan site in Northern Ireland.
Lisa Dorrian
No trace has been found of Lisa Dorrian (25) despite air, land and searches.
A PSNI spokesman today confirmed a man (22) had been arrested in connection with their investigation.
Ms Dorrian disappeared from Ballyhalbert Caravan Site near her home in Bangor, Co Down in February. Loyalist paramilitaries have been blamed for the murder.
The Irish and British governments have both pledged their support in helping to find her body.
A forensic expert brought in to help trace the so-called Disappeared - IRA victims murdered and secretly buried at the height of the violence in Northern Ireland - is also expected to examine the case.
Detectives have already questioned and released four men about the killing.