One person was airlifted to hospital on Sunday following a rollover north of Calgary.
It happened on Range Road 285 near Disbury, Alta. at about 6 p.m.
Investigators said four people were travelling in a truck when the driver lost control, sending the vehicle into field.
STARS Air Ambulance transported a 19-year-old passenger to hospital in serious, life-threatening condition.
Three other occupants, all from Calgary, were taken to hospital in non-life-threatening condition.
It’s unknown if speed or alcohol were factors in the rollover.
Anyone with information is asked to contact Airdrie RCMP at 403-945-7200.