Gardaí are continuing to question a 64-year-old man in connection with the disappearance of Mary Boyle almost 40 years ago.
The sic-year-old, from Kincasslagh in Co Donegal, went missing while visiting her grandparents in Ballyshannon in March 1977.
A 64-year-old man was arrested in the midlands yesterday. He is being held at Mullingar Garda Station.
This morning, gardaí extended the period of detention.