According to duty inspector Peter Casey, the call came in around 6:30 p.m. of a crash at the intersection of York Durham Line and 19th Avenue.
No further information on the cause of the accident will be released until the investigation has been completed, Casey added.
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One person has died in hospital after a two-vehicle collision near the border of Markham and Whitchurch-Stoufville.
Emergency crews were called to the area of York Durham Line and 19th Avenue around 6:30 p.m. for reports of a crash.
York Regional Police said one person with life-threatening injuries was taken to a hospital. The victim was later pronounced dead.
The driver of one of the vehicles was also taken to a hospital with non-life-threatening injuries, police said.
Road Closure Please avoid the area of York Durham Townline and 19th, Markham Stouffville. Police investigating a serious 2 vehicle collision.