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"I remember before the Australian Open this year, I was not in a very happy moment because there was still that case of doping," Sinner told Italian broadcaster RAI.

In a brief news conference on Saturday, acting Vancouver police chief Steve Rai said that men, women and young people were among the victims.

While investigators have not confirmed a motive, Rai said that police are confident "that the evidence in this case does not lead us to believe this was an act of terrorism."

At a separate news briefing on Sunday, acting Vancouver police chief Steve Rai said it was the "darkest day" in the city's history.

While Rai declined to specify any potential motive, he said that he "can now say with confidence that the evidence in this case does not lead us to believe this was an act of terrorism."