A search at a Co Wicklow quarry as part of the investigation into the disappearance and murders of Deirdre Jacob and Jo Jo Dullard in the 1990s is due to resume this morning.
The search began yesterday and is expected to last a number of days.
Gardaí have also renewed their appeal for information on the cases.
In the late 1990s, Operation Trace investigated the cases of six missing women who disappeared over a number of years from Leinster without a trace.
Jo Jo and Deirdre were two of the most high profile cases.
Of the two young women, both were last seen in Co Kildare, 21-year-old Jojo in 1995 in Moone and 18-year-old Deirdre in 1998 in Newbridge.
It is understood gardaí are acting on information they deem sufficient to carry out the dig.
Their focus is on uncovering items that may have evidential value.
Cold case review teams have been aware of the site for some time, but this is the first formal search of the area.
Gardaí say they are keeping an open mind and the two families informed.
They have appealed to anyone with information about the cases, no matter how small or insignificant they may feel it is, to contact them.
