A search has resumed in Omeath, Co Louth as part of the investigation into the murder of Belfast woman Saoirse Smyth.
The search of a wooded area off the Ferryhill road could last up to two weeks.
Ms Smyth, who was 28 when she went missing, was last seen in Belfast around 11 April 2017.
It is believed that on the same day she travelled just across the border to Omeath, Co Louth.
Last year, the investigation into the disappearance was upgraded to a murder inquiry.
Police said Ms Smyth, who battled drug addiction most of her life, was vulnerable and likely to have been exploited by others in the criminal underworld.
Her family said at the time that they believed her addiction may have in some way cost her life.
Following her disappearance two people, a man and woman, were questioned by detectives and released on bail.
PSNI officers as well as detectives from the Garda National Bureau of Criminal Investigation, supported by the Louth Divisional Search Team, are involved in the search.
A specialist forensic archaeologist and specialist sniffer search dogs are also being used.
