OPP in Wellington County say four people were hurt, with two suffering life-threatening injuries, as a result of a collision near Mount Forest over the weekend.
OPP say emergency services were called to Highway 6, south of Mount Forest, on Sunday at around 5 p.m.
According to police, two cars collided on the highway, with the cause remaining under investigation.
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Police say two of the injured people were transported by Ornge ambulance to trauma centres with life-threatening injuries.
Another two people with serious injuries were transported to local hospitals by Guelph Wellington paramedics.