Ottawa Police have charged a former teacher and coach in the Ottawa-Carleton District School Board with sexually abusing four students in the 1970s and 1980s.

Donald Greenham, 73, is facing 14 charges including gross indecency and indecent assault, which were Criminal Code charges at the time of the alleged offences.

The alleged victims—three males and one female—ranged in age from 14 to 17, and the incidents are alleged to have occurred between 1970 and 1982.

Police said they began their investigation on June 20 when an alleged victim came forward. Police said they are concerned there could be more victims.

Greenham was due to appear in court Monday for a bail hearing.