Postmortem examinations are being carried out on five members of an extended family who died after the car they were in slid off a pier into the water in Buncrana yesterday evening.
A four month old baby was taken from the car by a passerby and is said to be recovering well in Letterkenny University hospital.
Those who died were Sean McGrotty, his sons Mark and Evan, his mother-in-law Ruth Daniels and her daughter Jodie Lee Daniels.
Gardai are appealing for witnesses to come forward.
Superintendent Colm Nevin of Ballyshannon Garda station has described the incident as a tragedy.