Renfrew OPP is investigating a snowmobile collision that sent two snowmobilers to hospital.
The collision happened early Sunday morning in the Township of McNab Braeside.
According to police, there was a group of four snowmobiles travelling together.
Two of the snowmobiles collided and injured the riders.
Paramedics took one woman to the hospital with serious injuries.
Another man was airlifted to hospital with injuries listed as critical.
The OPP is not ruling out alcohol as a factor.