A five-year-old boy has died four days after being hit by an unmarked Surete du Quebec police car.

The crash happened last Thursday morning during rush hour in Longueuil.

The boy's father was making a left-hand turn at the intersection of Gaetan Boucher Blvd. onto Davis Blvd. when the SQ car rammed his vehicle.

The impact knocked the family's car across the street and into a stop sign.

All three occupants of the car were sent to hospital with serious injuries, although the lives of the 14-year-old and the 31-year-old driver were never in danger.

The Montreal police department was ordered to take over the investigation several hours after the crash occurred.