A 60-year-old Toronto man faces multiple charges of drugging, sexually assaulting and videotaping women working in the sex trade.

The charges were laid by the sex-crimes unit of York Regional Police, who allege Allen Chow chiefly located his victims via Internet websites, and that he was active in Markham and several areas east of Toronto, including Oshawa, Belleville and Cobourg.

He was arrested Monday and remanded in custody, with his next court date set for April 3.

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In all, Mr. Chow faces 21 counts of sexual assault and 21 sets of related charges. Many of the women were unconscious when they were videotaped, police said, adding that there are believed to be additional victims.