The Special Investigations Unit is urging witnesses to step forward after two people were seriously hurt when a car that a police officer was following collided with a TTC bus on the weekend.

According to the SIU, an OPP officer saw two vehicles speeding west on Highway 401, near Leslie Street, on Saturday morning.

The officer followed one of the vehicles getting off at Bathurst Street before turning west on Wilson Avenue. The vehicle collided with a TTC bus in the area of Keele Street and Sheppard Avenue West, the SIU said in a Sunday press release.

Police at the time reported that the collision happened at about 9:15 a.m.

Two occupants of the vehicle, a 23-year-old man and a 24-year-old woman, were ejected from the vehicle and taken to the hospital with serious injuries, the SIU said.

SIU investigators have been assigned to the case and are urging witnesses to come forward.

The SIU is an arm’s length agency that investigates reports involving police where there has been death, serious injury of allegations of sexual assault.

Jacob Lorinc is a breaking news reporter, working out of the Star’s radio room in Toronto. Follow him on Twitter: @jacoblorinc

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