CAPITALS — Canadian police are questioning a man suspected of driving a rented van into pedestrians in northern Toronto on Monday, killing 10 and injuring 15.
Alek Minassian, 25, was not previously known to authorities, police said, adding that the incident appeared deliberate but no motive was clear.
Mr Minassian was arrested after a tense standoff with a police officer.
Canadian Prime Minister Justin Trudeau called the incident a "senseless attack and a horrific tragedy".
The officer who arrested Mr Minassian was praised for not opening fire during a standoff with the suspect, who claimed to be armed and pointed an object at the officer.
Video broadcast on CBC News showed the suspect shouting "kill me", while the officer instructs him to get down.
When he said he had a gun, the officer said: "I don't care. Get down." He was then arrested without any shots being fired. He is due in court at 10:00 local time (14:00 GMT) on Tuesday.
Speaking at a news conference on Tuesday, Mr Trudeau praised the police officers involved, who he said "faced danger without a moment of hesitation".