According to the SIU, the multi-vehicle collision occurred on Sunday evening.
Preliminary information given to the SIU states that Toronto Police Service officers were near Markham Road and Nugget Avenue at approximately 8:15 pm. This is when they saw a Nissan Rogue travelling at a high speed southbound on Markham Road.
The officers proceeded to follow the vehicle. The Rogue was then reportedly involved in a collision at the Markham Road and Sheppard Avenue intersection. The SIU said that the other vehicle involved was a Ford Escape, which struck a Honda Civic after the initial collision.
The 52-year-old female driver of the Ford Escape and her 21-year-old passenger were transported to the hospital for treatment with serious injuries.
One subject officer and one witness have been designated, at this time.
Three investigators and two forensic investigators have also been assigned to the case.
The SIU is urging anyone who may have information about this investigation to contact the lead investigator at 1-800-787-8529. The unit is also asking anyone who may have any video evidence to upload it through the SIU website.