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Hussain apparently had been spoken to by authorities about his online activities. Sources say Toronto Police, the OPP and the RCMP have all had an interest in the now-deceased shooter.

What law enforcement is saying is that the attack was planned, and Hussain was “well known to Toronto Police” for investigations into past crimes “involving weapons and violence.”

He was also known to hang out behind his building at 43 Thorncliffe Park Blvd. with a group of 20 friends.

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“Police were called once because they thought Faisal was carrying a gun,” said someone who was there. “No gun was found.”

Meanwhile, Hussain’s family emailed a statement to CBC News outlining a life-long struggle with mental illness, depression and psychosis.

“We are utterly devastated by the incomprehensible news that our son was responsible for the senseless violence and loss of life that took place on the Danforth,” the statement read.

“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.

“Our hearts are in pieces for the victims and for our city as we all come to grips with this terrible tragedy. We will mourn those who were lost for the rest of our lives.”

A neighbour living near the apartment where Hussain lived with his parents said Faisal told him he previously worked in a bakery and as a grocer. While some friends said he was “not at all radical,” others said he was more interested in Islamic discussions “when there were more people around.”