A man and a woman have been arrested in relation to an alleged assault on a then nine-week-old baby girl, who suffered serious head injuries at her home in Louth in September.

The infant is currently critically ill at Dublin’s Temple Street Children’s Hospital.

The pair, both aged in their 30s, were arrested separately yesterday at different times and are currently being questioned by specialist officers.

They are being held at Drogheda and Dundalk garda stations where they are being questioned under Section 4 of the Criminal Justice Act.

A decision to release or charge them must be made today.

It is understood that the male suspect was arrested yesterday morning a number of hours before the woman was arrested.

He is being questioned in Drogheda while she is being questioned in Dundalk Garda Station.

The baby is being treated in hospital for what are described as very serious injuries.

The small child had a number of bruises on her body and the case was upgraded to a criminal investigation after the results of medical reports and initial interviews with the two adults were examined by the investigation team.