The mass shooting in the Greektown district came just three months after a man used a van to plow over pedestrians on a sidewalk in another Toronto district, killing 10 people and injuring 14 in an attack apparently aimed at women.
On July 22, shortly after 10pm, a 29-year-old man armed with a handgun entered several restaurants on Toronto's Danforth Avenue, opening fire at several groups of people.
Local law enforcement officials said the suspected shooter also died, but it's not clear whether he was killed by police or if he shot himself.
The gunman killed 18-year-old Reese Fallon of Toronto and a 10-year-old girl who has not been publicly identified. The wounded victims ranged in age from 10 to 59, and some might have life-changing injuries, he said.
The family said the suspect "had severe mental health challenges, struggling with psychosis and depression his entire life", and that the "interventions of professionals were unsuccessful" in treating him.
"My thoughts are with everyone affected by the awful tragedy on the Danforth last night in Toronto, and may the injured make a full recovery", Trudeau said on Twitter.
A now-deleted Facebook post indicated anger toward women and saluted Elliot Rodger, a community college student who killed six people and wounded 13 in shooting and stabbing attacks near the University of California, Santa Barbara, in 2014. Medications and therapy were unable to treat him.
Ontario Premier Doug Ford called it a "horrific act of gun violence" and said his heart went out to the victims.
Mr Saunders said the gunman died after exchanging gunfire with police.
"Guns are too readily available to too many people", Mr Tory said. Under the legislation, businesses would have to maintain inventory and transfer records for non-restricted firearms, allowing police to better trace firearms, a spokesman for Public Safety Canada said in a statement.
Council members discussed gun violence, its causes, its effects and potential solutions during a meeting that began Tuesday morning and lasted into the evening. She said she was told to run to the back of the restaurant.
Hussain's family expressed condolences in a statement.
Toronto Mayor John Tory, speaking at the overnight news conference, acknowledged the Canadian city's problems with gun violence.
Ashley Robinson saw Faisal Hussain nearly every day when she walked her dog on the winding sidewalk near her high-rise apartment building in Toronto.
The incident comes with Canada's largest metropolis concerned over a surge of shootings.
Don't miss out on the latest news and information.
The condition of the other victims is not known yet, a police spokesman said.
Last week, Toronto police started implementing the enforcement component of their "gun violence reduction plan". Toronto has seen 23 gun-related homicides so far this year, compared to 16 in the first half of 2017.