A suspect is in custody and the van has been located, Toronto Police media representative Gary Long told CNN.
'He just kept on going and people were flying everywhere'. Other authorities have said at least seven people were injured and a photo appears to show at least one person dead.
The incident happened around 1:30 PM EST and a van from Ryder was responsible for the carnage.
Public safety minister Ralph Goodale said it was too soon to draw any conclusions about Monday's incident.
Fifteen people remained in hospitals throughout the city, Saunders said, adding that local, provincial and federal investigators were probing the case. Authorities have not singled out a motive, but the incident follows the pattern of several terrorist attacks in the last few years.
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Freeland invited about a half dozen non-G7 foreign ministers to the summit and hosted them at a dinner before their formal Sunday morning meeting.
A tense standoff between the suspect and police followed, recorded by a nearby witness, in which the male suspect insisted that he was armed and that officers shoot him.
Emergency personnel respond to the scene where a van was driven into pedestrians in Toronto, Canada.
Toronto police investigates an incident where a van struck multiple people at a major intersection in Toronto's northern suburbs in Toronto, Ontario, Canada, April 23, 2018. The attacker, Abdulahi Hasan Sharif, had an Islamic State flag in his vehicle and was known to police for "espousing extremist ideology".
"I must have seen about five, six people being resuscitated by bystanders and by ambulance drivers", Mr Zullo said.
A van has ploughed through a crowd of people in the Canadian city Toronto where Toronto police said between eight and 10 people may have been injured. He said in a statement to reporters: "Our hearts go out to anyone effected".
The incident occurred on Yonge Street and the suspect fled between half a mile and a mile from the vehicle before being apprehended. "We are going to have more to learn and more to say in the coming hours". "Thank you to the fearless EMS and first responders who are working tirelessly to help". "I hope we will, as a city, remind ourselves of the fact that we are admired around the world as being inclusive and for being accepting, understanding and considerate, and that we are united in standing in solidarity, especially with those who have fallen victim to this bad tragedy".