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.

Pedestrian Dies After Collision On R445 Monasterevin Road Outside Kildare Town
Fine Gael TD Calls For Restricted Bin Collection Times To Ease Traffic Delays
Gardaí Continue Their Road Traffic Enforcement Operation Throughout The Christmas Period
New Quality Mark To Be Introduced To Crack Down On Bogus English Language Schools
Concerns Rise As Organ Transplant Operations Decline
Locals Are Being Advised To Make New Years Celebrations Stress-Free For Their Pets
Kfm Recruiting for Advertising Sales Dept.
Further Increase Expected In Number Of Landlords Leaving Property Market, As Price Of Three-Bed Semi Rises In Kildare