They say rocks have been thrown intentionally at cars in Markham, causing collisions
An appeal from provincial police to help them find those responsible for throwing rocks at vehicles in Markham.
Since September 20th, Aurora police say there have been 11 reports of rocks intentionally thrown at vehicles along Highway 48, and York police say there have been nine reports.
They add in one case, there was a severe collision, leaving two people with life threatening injuries.
One person has been released, the other remains in hospital.
Police say it appears people in an SUV may be involved.
A warning to viewers, this video contains a collision.