Toronto police are investigating after gunfire near Thorncliffe Park Drive and Overlea Boulevard on Saturday night.
Police were called by a neighbour shortly before 11 p.m.
She'd heard gunfire and could see a man lying on the ground outside.
Upon arrival, police found two injured people who were both rushed to hospital.
One was a teenage boy, and the other was an adult man, according to police.
One had serious injuries while the other had life-threatening injuries, police say, although according to current information it's not clear whether it was the youth or adult in life-threatening condition.
Police say they currently have no potential vehicle information or suspect descriptions.
The investigation is ongoing.