Officers responded around 11 p.m. Monday night to a plaza in the area of Weston Road and Highway 401.
Investigators said crews did not initially find the victim on scene when they arrived, but was later located further south of the plaza.
There were reports that the shooting had occurred in the parking lot.
Paramedics said the victim was taken to a trauma centre in life threatening condition for treatment.
One witness told media at the scene that he initially saw two men running after one car, with one suspect reaching into their bag – then moments later, he saw a man lying on the ground bleeding.
“I tried to help [the victim] out, and he started crying, [saying] ‘I’m dying, I’m dying'” Deric Cruz said when he attempted to approach the victim.
Cruz said he believes he heard at least eight to nine gunshots during the incident.
No word yet on any suspects, but the investigation remains ongoing.
Weston Rd/ Hwy 401
– units are OS
– 1 male victim located with serious injuries
– he is being taken to hospital
– units are continuing to investigate#GO1581531^adc
— Toronto Police Operations (@TPSOperations) August 20, 2019