According to police, around 4:10 p.m., a white truck was passing vehicles when it pulled in front of an SUV heading south on the Queen Elizabeth II Highway, about two kilometers south of the Highway 581 overpass near Carstairs. The truck then braked “aggressively” in front of the SUV, with a family inside, Mounties said. In an attempt to avoid the truck in front of them, the driver of the SUV swerved but lost contact with the road, rolling before coming to rest along the median fence. A five-year-old child was ejected from the SUV and was rushed to the hospital by STARS in life-threatening condition. Police say the other four occupants, two children and two adults, were taken by ground ambulance to area hospitals in serious condition. The white truck did not remain at the scene of the crash, RCMP added. For four hours, investigators remained at the scene and traffic was restricted to one lane northbound and southbound. After 9 p.m., all lanes were reopened. RCMP are asking anyone who witnessed the crash or has dashcam footage to contact the Didsbury division at 403-335-3382 or Crime Stoppers at 1-800-222-8477. Tips can also be submitted online.