Three people were injured in a two-vehicle crash north of Calgary on Sunday.
Emergency crews were called to Highway 566 near Balzac, Alta., at around 5:30 p.m.
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RCMP said it appeared a pickup truck hit a car, forcing both vehicles off the road.
EMS said three people were taken to the Foothills Medical Centre; one woman was flown to the hospital by STARS Air Ambulance with serious, potentially life-threatening injuries while two other people were taken by ground ambulance in serious but stable condition.