Four people are in hospital following a crash between a car and bus on Highway 93.

RCMP say it happened about 20 kilometres north of Lake Louise by Hector Lake in Alberta's Rockies.

The collision was between a small four-door sedan and a Brewster coach bus. 

"Initial investigation indicates that the Brewster coach was travelling north towards Jasper, while the sedan was travelling south towards Lake Louise," said RCMP in a release. "Road conditions are believed to be a factor."

The 20-year-old woman driving the sedan had to be removed from the car with help from the Jaws of Life. She was airlifted to a Calgary hospital in stable, non-life threatening condition.    

Three female passengers in the sedan were also taken by ground ambulance to the Banff Mineral Springs Hospital with non-life threatening injuries.

The bus driver was not injured and had no passengers at the time.