Four people sustained non-life-threatening gunshot wounds at Monday's rally celebrating the Raptors' championship.
Three arrests were made, according to Toronto Police Chief Mark Saunders, who added that the investigation was ongoing.
A reported 1.5 million packed Toronto's downtown for the Raptors' parade and subsequent rally at City Hall. The shootings occurred at Nathan Phillips Square, adjacent to City Hall. Additional people sustained minor injuries attempting to flee the scene after the shots were heard.
Mayor John Tory said in a statement: "It is disappointing and I'm sure a source of anger for more than just me that anyone would carry a gun and discharge it at what was otherwise a joyous celebration."