Open this photo in gallery: Protesters wave flags and sing as police line the entrance to the Art Gallery of Ontario, where a cancelled event for Prime Minister Justin Trudeau and Italy's Prime Minister Giorgia Meloni was to take place, in Toronto, on Mar. 2.Cole Burston/The Canadian Press Investigators with the Toronto Police are reviewing whether illegal activity occurred during a weekend protest that led to the cancellation of a reception hosted by the prime minister for a visiting G7 leader, the force said Sunday. The Saturday evening event at the Art Gallery of Ontario was meant to cap off...