A man in his 70s has been charged following a series of sexual assaults on TTC vehicles.

Police launched the investigation in September, when several assaults were reported across the city.

Officers said in each of the incidents, a man boarded a TTC vehicle then targeted women who were also onboard.

"He would make physical contact and sexually assault them," police said in a statement Thursday.

Following the investigation, 78-year-old Cheuk-Hang Lo was arrested. He has been charged with three counts of sexual assault.

Police said they believe there may be more victims. Anyone with more information is asked to call police at 416-808-7474, or leave an anonymous tip with Crime Stoppers at 416-222-8477 (TIPS).