MISSISSAUGA, Ont. - Ontario's police watchdog is investigating after a vehicle fleeing Toronto police struck a 22-year-old cyclist, leaving her with a broken leg.

The Special Investigations Unit says officers pulled over a vehicle on a downtown street Wednesday afternoon but the car drove off when the officers approached on foot.

The SIU says the fleeing car was struck by another vehicle, then lost control and crashed into the cyclist, who was taken to hospital for treatment of her broken leg.

The 24-year-old driver fled the scene on foot but was apprehended soon after and taken to hospital with a jaw injury, while an occupant from the other vehicle was taken to hospital with a shoulder injury.

Anyone who witnessed the incident is asked to contact the SIU.

The Special Investigations Unit is an arm's-length agency that investigates reports involving police where there has been death, serious injury or allegations of sexual assault.