Silverthorn Collegiate Institute in Etobicoke was in lockdown late Tuesday afternoon after reports of a person with a gun inside the school.

Toronto Police were called to the Mill-Burnhamthorpe Rds. area at 3:59 p.m. for the gun report and said in a post on the social-media site X that there was “evidence of a firearm discharge located.”

There were no injuries reported.

In a follow-up post at 4:58 p.m., police said two individuals were reportedly inside the school with a gun.

Officers were actively clearing the building, police said, and there were no immediate suspect descriptions available.