The SIU is now investigating a single vehicle crash in Mississauga.
All 5 people are said to have walked out of the vehicle under their own power, although 4 people were taken to hospital.
The incident occurred near Eglinton and Mississauga Rd just before noon.
Police say it's unclear whether speed played a factor as the vehicle struck a pole on the corner.
The condition of the victims is not yet known.