An Ontario man has been arrested in Calgary and charged as part of a human trafficking investigation. Authorities allege the man from Scarborough was “sex trafficking a vulnerable female.” Alberta Law Enforcement Response Teams (ALERT) and the Calgary Police Service picked the man up this past Friday in Sunridge in the city’s northeast. ALERT said in a release Tuesday a tip was received about “a known sex trafficker operating in the Calgary area.” “We were able to gather intelligence, conduct an investigation and quickly make an arrest,” said Staff Sgt. Matt Pumphrey with ALERT. Mark Williams, 42, has since been charged with “procuring a person for sexual services.” He’s next scheduled to appear in court Thursday. ALERT believes “there may be additional victims in this case” and said in Tuesday’s release the investigation is ongoing. ALERT encouraged anyone with relevant information to call their local police force or Crime Stoppers.