Authorities in Kingston, Ontario, say they are trying to figure out how three teenage sisters and a woman wound up dead in a submerged car.

CTV Montreal reported Wednesday the bodies of the siblings, ages 13, 17 and 19, and the woman, a relative in her 50s, were pulled from more than 15 feet of water in Kingston Mills locks northeast of Kingston Tuesday morning.

The victims' names were not released.

"It's very tragic ... very, very strange," Kingston police Constable Mike Menor said. "It's a really weird spot where the car was. It's not a spot where you would drive."

The Kingston Whig Standard reported the victims had stopped in Kingston on their way from a holiday near Toronto to their home in Quebec.

Autopsies are to be performed Thursday in Ottawa.