Cedarbrae Collegiate Institute in Scarborough, ON was placed on lockdown after reports of several gunshots at the rear of the building.
Bullet hols were found in a car and shell casings in the area.
There were no reports of any injuries.
Police are searching for a suspect described as a black male, 18-20 yrs old, 5'10"-6'0" tall, slim build, wearing a black winter toque and red sweatshirt.
As a result of this police investigation, the following schools are in Hold & Secure:
Willow Park JPS
Scarborough Village PS
Cedar Drive JPS
Golf Road JPS