It wasn't clear if two overnight shootings in the Ville Marie borough are connected.
A 911 call was made about a man who had been shot near Notre-Dame and Ste-Helene.
A 27-year-old victim had been injured in the foot and was taken to hospital.
Witnesses said a fight at a nearby bar moved outside and then there was gunfire.
The suspect fled before authorities got there.
A 21-year-old man later called 911 to say he'd also been shot in the vicinity.