South Simcoe Police Service officers are investigating a serious, two-vehicle collision that sent four people to hospital in Innisfil.
On Wednesday around 6pm, police were called to the intersection of 14th Line and 10th Sideroad for a two-vehicle collision involving a rollover.
Two people had to be extricated and four people were sent to hospital.
Two were subsequently airlifted to Toronto.
The road was closed for several hours for an investigation.
The cause of the collision has not yet been determined.
