Police say three children and a woman have died following a multi-vehicle crash in Brampton, Ont., that also sent a man to hospital with life-threatening injuries.
Peel Regional Police say the crash happened shortly after 12:15 p.m. and the province's police watchdog is taking over the investigation.
Const. Akil Mooken declined to comment on why the Special Investigations Unit was involved.
He did not comment on the age of the children, only saying they were under the age of 18.
It's not yet clear what led to the crash.
Police are asking any witnesses to come forward.