TORONTO - The man accused of shooting 15 people and killing two on a busy, restaurant-filled Toronto street struggled with severe mental illness, his family said in a statement late on Monday (July 23) as police sought a motive in the shooting spree.

Less than a day after two young women, ages 10 and 18, were killed and 13 other people were wounded by a gunman, the suspect was identified by the independent Special Investigations Unit (SIU) as Faisal Hussain, a 29-year-old Toronto resident. He was found dead shortly after the shooting, authorities said.

"We do not know why this happened," Toronto Police Chief Mark Saunders told reporters on Monday, adding that he would not speculate about the gunman's motive. "It's way too early to rule out anything."

The suspect, armed with a handgun, opened fire at 10pm EDT on Sunday (0200 GMT Monday) on a stretch of Danforth Avenue filled with restaurants and family-friendly attractions in the city's Greektown neighbourhood, the SIU said.

"We are utterly devastated by the incomprehensible news that our son was responsible for the senseless violence and loss of life," Hussain's family wrote in a statement, adding that he suffered from severe mental illness as well as from "psychosis and depression his entire life".

"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," the statement said.

Police did not identify the two young women killed in the shooting spree. A local politician Nathaniel Erskine-Smith confirmed the 18-year-old victim was Reese Fallon, a recent high school graduate who planned to study nursing.

"The family is devastated," Erskine-Smith said in a statement, adding that they have asked for privacy while they mourn a young woman who was "smart, passionate and full of energy."

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2 dead including gunman, 13 people injured in Toronto shooting

The gunman exchanged fire with police, fled and was later found dead, according to the SIU, which investigates deaths and injuries involving police.

The suspect had a gunshot wound, authorities said, but would not elaborate on the circumstances or cause of his death. An autopsy on the suspect will be conducted on Tuesday, SIU spokeswoman Monica Hudon said.

Hours after the fatal shooting, in an apparently unrelated incident, a man with a knife was arrested during a military ceremony on Parliament Hill in Canada's capital, Ottawa. The Defence Ministry said no one was injured and gave no further details.

Prime Minister Justin Trudeau wrote on Twitter on Monday:"The people of Toronto are strong, resilient and brave - and we'll be there to support you through this difficult time." Toronto Mayor John Tory told reporters the city has a gun problem, with weapons too readily available to too many people.

"Why does anyone in this city need to have a gun at all?" he asked in an address to city councilors early on Monday.

Bill Blair, Canada's newly appointed minister of border security and organised crime who has been given the job of tackling gun violence, met with Tory on Monday afternoon.

To own a gun in Canada an individual must apply for a license, pass a background check and pass a firearm safety test. Guns must be kept locked and unloaded and can only be legally carried outside the home with a special permit. Handguns and other restricted firearms require passing an additional course.

Canada's crime rate rose by 1 per cent in 2017, the third consecutive annual increase, according to Statistics Canada. The murder rate jumped by 7 per cent, due largely to killings in British Columbia and Quebec, while crime involving guns grew by 7 per cent.

Toronto is grappling with a sharp rise in gun violence as gun deaths jumped to 26, up 53 per cent so far this year from the same period in 2017. The number of shootings has risen 13 per cent.

Toronto has deployed about 200 police officers since July 20 in response to the recent spate in shootings, which city officials have blamed on gang violence.

Saunders said the police presence would be increased in the Danforth area following the shooting.

In April, a driver deliberately plowed his white Ryder rental van into a lunch-hour crowd in Toronto, police said, killing 10 people and injuring 15 along a roughly mile-long (1.6-km) stretch of sidewalk thronged with pedestrians.