A mother and two daughters who died after being pulled from a hotel swimming pool in Gananoque likely drowned over a period of 10 minutes, police said.

An 11-year-old girl was the third family member to die after a weekend incident at the Best Western Country Squire Resort.

Sunaila Kaianad died Tuesday night. Her mother, Naila Yasmin, 43, and her 14-year-old sister died of their injuries earlier this week.

Police said autopsy results do not suggest foul play or that the pool's chemicals played a role in the incident.

The Toronto family was on vacation at the time of the tragedy. Police said it's believed none of them knew how to swim. All three were pulled from the deep end of the swimming pool with no vital signs.

A witness who saw the family prior to the incident told police the two sisters were in the shallow end of the swimming pool, while their mother supervised from the pool's deck.

About 10 minutes later, a father with two children entered the unsupervised pool and found the family.

The victims were part of a family of six guests staying at the Best Western hotel. Yasmin's husband and two sons were eating breakfast inside the hotel at the time of the incident.

With files from The Canadian Press