Toronto police say a 15-year-old boy was sexually assaulted at the Canadian National Exhibition. Police allege that it happened Tuesday afternoon in a washroom at the Direct Energy Centre. It's alleged a man struck up a conversation then sexually assaulted the teen. The suspect is described as Chinese, 50 to 60 years old, five-foot-five, with a thin build and thinning, short black hair and he was wearing a white, unbuttoned, collared dress shirt with a white tank top underneath. Police want to hear from anyone with information. The annual exhibition, billed as Canada's largest annual fair, started Aug. 17 and runs to Sept. 3.