A man aged in his 40s has been arrested in connection with the disappearance of a woman (29) in Co Mayo more than 10 years ago.
The man was arrested in Ballina early this morning and is being held under Section 4 of the Criminal Justice Act 1984 at Ballina Garda station.
A woman (21) who was arrested yesterday in connection with the same inquiry, has been released without charge.
Sandra Collins disappeared on the night of December 4th 2000 in the seaside village of Killala. Ms Collins visited a shop in Killala at 7.45pm that night, and was last seen at a takeaway on George's Street at 11pm.
In a potential breakthrough in the case some weeks ago, the presence of a white van in the vicinity of George's Street between 11pm and midnight was confirmed to gardaí.
This week's arrests are the first in the case since a renewed appeal for information was issued last December on the 10th anniversary of Ms Collins's disappearance.
Gardaí have repeated their appeal for anybody with information the case to come forward.