Although officials have yet to determine a motive for the crime, they have not ruled out terrorism. "We do not know why this happened yet," Toronto Police Chief Mark Saunders told reporters. "The investigation itself is very fluid, it is very new, it's going to take some time."
Local police were first alerted to the shooting at roughly 10:00 p.m. local time in Toronto's Greektown neighborhood. Two people, an 18-year-old aspiring nurse and a 10-year-old girl, were killed, and 13 others were injured.
AP reports that Hussain's family said he suffered from serious mental problems, but they never expected him to become violent.