STARS air ambulance responded to a collision just outside of Okotoks early Wednesday morning.

EMS from Okotoks were dispatched to a call of a motor vehicle collision in the area of Highway 7 and 16th Street West before 7:30 a.m.

The crash involved a pick-up truck and a car and requested STARS to attend the scene.

Paramedics say three patients were treated from the collision, one being a woman in her 50's who was the single occupant and driver of the car who was flown to Foothills Hospital in serious condition with head injuries.

The two occupants of the pick-up truck, a woman in her 40's and a teenage girl, were assessed by EMS and didn't require transportation to a hospital.

The factors that lead to the crash remain under investigation by the RCMP.

Highway 7 remains closed while emergency crews are on scene.

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