SIU called in after crash on Hwy. 401 in Oshawa

The Special Investigations Unit (SIU) has been called in after a crash on Highway 401 in Oshawa, provincial police said.

In a post on X on Sunday, Ontario Provincial Police (OPP) said the scene was on the eastbound lanes of the highway near Stevenson Road.

OPP first tweeted at 4:30 p.m. saying some lanes of the highway were closed for a police investigation. Around two hours later, police updated to say the closures were for a crash and that the SIU has taken over the investigation.

The SIU says an OPP officer was conducting speed enforcement on Highway 401 in the Thickson Road area.

The officer tried to stop a driver going eastbound on the highway, but the driver fled.

Shortly thereafter, the driver was involved in a single-vehicle crash and the car rolled over.

There were four occupants in the vehicle and all were taken to hospital with serious but non-life threatening injuries.

Police say the right eastbound lane of the highway and off-ramps are closed until further notice.

The SIU is an independent government agency that investigates the conduct of police officers in incidents that may have resulted in death, serious injury, sexual assault or the discharge of a firearm at a person.