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 as police sought a motive in the shooting spree. "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. "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". The suspect had a gunshot wound, authorities said, but would not elaborate on the circumstances or cause of his death. Toronto Mayor John Tory told reporters the city has a gun problem, with weapons too readily available to too many people.