Four people were injured in gunfire northwest of Toronto on Wednesday evening, the Canadian Broadcasting Corporation (CBC) quoted police as saying.
Medics said the injuries ranged from serious to critical, and the injured were rushed to hospitals immediately.
The shooting took place in the Clearview Heights area, where police were called to the scene at 7:33 pm.
Officials at the site were trying to find out if there were other victims, while the police did not release any information about the suspects.