A 70-year-old woman is dead this afternoon after a three-vehicle crash just inside the town limits of Cochrane, located west of Calgary. 

Police say the woman's car went into the oncoming lane on Highway 22 around 2:45 p.m. MT and struck a southbound van head on, which then bumped into a school bus in the next lane.  

The drivers of the van and bus were not seriously injured, but the woman was pronounced dead at the scene.   

There was minor damage to the bus, but there were no children on it at the time of the incident.