Further services are scheduled Saturday for the four Montreal relatives found dead near Kingston when their car submerged in a Rideau Canal lock.

Three sisters -- Zainab Zainab Shafi, 19, Sahar, 17, and Geeti, 13 - and their aunt, Rona Amir Mohammed, 50, were in the Nissan Sentra discovered June 30 at Kingston Mills.

The car was submerged in three metres of water. None of the girls knew how to swim.

Autopsies were performed in Ottawa last week. However, it is expected to take some time to determine if drowning was the cause of death.

The four were buried last Sunday at an Islamic cemetery in Laval, Que. But relatives from the north-end Montreal borough of Saint-L�onard also plan to travel to Kingston Mills for a vigil.

The tragedy has stumped Kingston police, who are looking for business surveillance videos and tips from the public.

Mohammed Shafi, the girl's father, said he believes the car ended up in the water after one of his daughters got behind the wheel.

The family was travelling in two separate cars on the way home from a vacation to Niagara Falls, Ont. The girls' mother said the last time she saw her children was when Zainab asked for the car keys.

She told her mother she needed the keys to get some clothes left in the car. When the family woke up the next morning, the vehicle was missing.

Shafi said even though his daughter had no driver's license, she had a history of swiping the family's car keys to impress friends with her driving.

The girls were born in Afghanistan and have four other siblings. The family moved to Canada two years ago in hopes of offering their children an opportunity for a better life.