Gardaí say the results of a post mortem will determine the course of the investigation.
A forensic examination on a car, in which a six-year-old boy was found dead, in county Waterford has concluded.
The car has been removed from the scene at Rathmoylan Cove beach in the past hour and door to door inquiries are continuing.
A woman in her late 30s, arrested at the scene after midnight, remains in custody.
Gardaí say the results of a post mortem will determine the course of the investigation.

Damning Audit Reveals €1.6m Moone-Timolin Cycleway As Safety Time Bomb
Five Kildare Special Schools Included In New Scheme Bringing Therapists Directly Into Schools
Give Gardai Scramblers To Enforce Law On Illegal Bikes, Says Kildare Garda Member
Labour Urges EuroGiant To Give Workers Clarity As Job Fears Grow
Panda Raises Bin Costs In Parts Of The Capital, Leaving Door Open To Wider Hikes Across Leinster
Major Drainage Project Serving Kildare Moves To Early Procurement
Flood Risk Rises In Kildare As Multiple Areas And Routes Close
Parents Contacted After Gardaí Seize Illegal E-Scooters From Minors In Naas