Three people have been killed in Toronto, with one of the fatalities believed to be caused by a crossbow, say police.
Attending to a reported stabbing in the Scarborough area, police found two people dead and one person wounded. The injured person later died.
One person is in custody and a crossbow was found in the vicinity.
One of the victims suffered injuries consistent with a crossbow, a police official told Canadian media.
Constable Jennifer Sidhu, a Toronto police spokeswoman, told the BBC that police received reports of a stabbing incident and arrived just before 1300 EST (1800 GMT) to find the three injured in a garage.
Ms Sidhu confirmed that a fourth person at the scene had been taken into custody.
Police later said two of the victims were male and the third victim was a woman, according to Canada's national broadcaster CBC.
A motive for the attack is still unclear, police added.