Four people were shot and wounded at a rally Monday for the NBA champion Toronto Raptors, and three people were arrested, police said.

Droves of Raptors fans ran from the shooting in a stampede from the City Hall square, which was packed with tens of thousands of people. An estimated 1.5 million fans earlier packed downtown Toronto for a parade for the Raptors, raising concerns about safety and overcrowding.

Toronto Police Chief Mark Saunders said four people suffered gunshot wounds but added that none of the injuries were life-threatening. Others suffered minor injuries as they tried to get away from the shooting, said Saunders, who asked for witnesses and people who might have video to come forward and help investigators.

During a speech from one of the team owners, the host of the rally interrupted the proceedings to alert the crowd to an emergency and asked for calm. Canadian Prime Minister Justin Trudeau, Toronto Mayor John Tory, NBA Finals MVP Kawhi Leonard and other Raptors players were onstage at the time.