One of the teenagers injured in an all-terrain vehicle crash on the outskirts of Orangeville has been airlifted to a trauma centre in Toronto.
A couple of 16-year-olds were operating ATVs on private property around County Road 109 and Willoughby Road in Orangeville when the their machines collided.
The second operator was also hospitalized.
OPP collision investigation specialists have taken over the case.
Anyone who witnesses the crash is asked to contact police.