It's a frightening prospect: the Danforth shooting could have been much worse.
Police previously identified the other person killed in the shooting as 18-year-old Reese Fallon.
Sources also believe he had training because he was able to reload the gun while on the move.
Toronto police executed a search warrant at Hussain's seventh floor apartment unit where he lived with his family.
Gun violence is nearly unheard of in the area and in Toronto, and the realization that a neighbor had gotten a handgun was deeply unsettling to many of Hussain's neighbors.
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Toronto police say they have "no evidence" that the gunman behind Sunday's deadly shooting rampage in Toronto was connected to the Islamic State extremist militia after the group claimed responsibility for the attack on Wednesday.
Toronto's police chief said earlier Monday that the authorities had not yet determined a motive for the attack. "We will continue to explore every investigative avenue..."
The teacher, who asked Global to remain anonymous, taught Hussain at Victoria Park Collegiate Institute in 2009 and 2010.
Subsequent media reports dug deeper into Hussain's life, publishing accounts from former teachers who shared accounts of alarming behaviour he exhibited while still in his teens.
In one instance, school officials contacted police after Hussain made comments about "liking death" and comparing himself to "The Joker", a criminally unstable character in the Batman movies and comics.
Friends described Hussain as quiet and polite.
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Hussain's family, in a statement to CBC News, denounced his "horrific actions" and said he had mental problems.
"What we will see as a result of this is that people will go into hiding even more", he said. "His parents are attractive". My friend pulled me by my arm because he saw that the guy was aiming (at) Resse and me. He said Hussain, a Toronto resident, was "polite, respectful, humble" and quiet, and didn't really talk to many people.
Witnesses said the shooting rampage lasted just a few minutes and sparked panic in the popular neighborhood of bars and restaurants.
In July of 2017, court document show Fahad was in a coma in hospital due to an overdose and about six months later the Crown stayed the charges against him. "And the one daughter, she died (in a vehicle accident)".
Toronto police say they have no information that he has traveled overseas recently. "While we did our best to seek help for him throughout his life of struggle and pain, we could never imagine that this would be his devastating and destructive end", they said.
Sinha said current research suggests people with a "major mental illness" are 2.5 times more likely to be victims of violence than other members of society.
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"Occasionally, and tragically, some people with psychotic illness do act out in a very violent way". "People with psychosis are at greater risk of being the victims of violence then of perpetrating violence".