Gardaí are to begin a new search today for Fiona Pender who disappeared 18 years ago.
The 25 year old went missing from her flat in County Offaly in August 1996 - she was 7months pregnant.
A review of the case was launched by detectives last year and it's believed a breakthrough has led to the latest search.
Garda authorities are to brief members of the media on developments later.