A collision in Longueuil involving an unmarked police car sent three people to hospital.

The crash happened during the Thursday morning rush hour when a driver tried to make a left-hand turn from Gaetan Boucher Blvd. onto Davis Blvd.

The Surete du Quebec police officer driving an unmarked vehicle rammed the right-hand side of the car, destroying the front end of the police cruiser and knocking the other car across the street and into a stop sign.

A 31-year-old man and his two children -- 14 and 5 years old -- were all badly hurt.

On Friday morning Montreal's police department, which has taken over the investigation, said the teenager's life was no longer in danger, but the 5-year-old remained in critical condition.