A suspect is in custody after three people were found stabbed to death Friday morning in an apartment building in Montreal’s Rosemont-La Petite-Patrie borough, police say.
Authorities were called to the scene on Bélanger Street near the Viau Street intersection shortly after 9 a.m. where they found the three victims who were pronounced dead at the scene.
Officers say they arrested an individual outside the building and the incident is being investigated as a triple-homicide.

Montreal police attend the scene of a triple stabbing, in Montreal, Friday, March 17, 2023. Montreal police say a suspect is under arrest after three people were found stabbed to death inside an east-end Montreal apartment.
THE CANADIAN PRESS/Ryan Remiorz
Montreal police attend the scene of a triple stabbing, in Montreal, Friday, March 17, 2023. Montreal police say a suspect is under arrest after three people were found stabbed to death inside an east-end Montreal apartment.
THE CANADIAN PRESS/Ryan RemiorzPremier François Legault issued a statement offering his condolences to the families of the victims, adding that he was following the situation closely.
Trois vies ont été arrachées ce matin à Rosemont. C’est terrible. Mes pensées accompagnent les familles et les proches des victimes touchées par ce drame. Nous suivons la situation de près.
— François Legault (@francoislegault) March 17, 2023
Montreal Mayor Valérie Plante also tweeted out a reaction to the news Friday morning, saying she was thinking of the three people who died under horrible circumstances.
J’ai une pensée pour les trois personnes qui sont mortes dans des circonstances horribles dans Rosemont. Mes condoléances à leurs proches. 💔
Le @SPVM mène l’enquête pour élucider les circonstances du drame. #polmtl
— Valérie Plante (@Val_Plante) March 17, 2023
Authorities barricaded off the street consisting of low-rise apartment buildings, across the street from the Montreal Heart Institute. That section of Bélanger Street remained closed off to traffic, which blocked the main entrance to the building.

Montreal police attend the scene of a triple stabbing, in Montreal, Friday, March 17, 2023. Montreal police say a suspect is under arrest after three people were found stabbed to death inside an east-end Montreal apartment.
THE CANADIAN PRESS/Ryan RemiorzAn ambulance with lights flashing remained on scene, along with a police mobile command post and a large number of police vehicles.
Three people found stabbed to death at a residence in Rosemont this morning just after 9am. Suspect in custody. Cops not yet saying ages or how suspect and victims are linked. pic.twitter.com/0JbrZjHbck
— Dan Spector (@danspector) March 17, 2023
A spokesperson for the Urgences-santé ambulance service said it was called to the scene, but no transports were needed.
Vincent Marissal, the Québec solidaire member who represents Rosemont in the legislature, said he has reached out to the province’s public security minister to get more information about what happened.
“My first reaction was a thought for the victims, we have three people dead this morning, that’s awful, that’s terrible,” he told reporters at the scene.
Police couldn’t yet provide any further details on the victims nor their relationship with the suspect.

Montreal police attend the scene of a triple stabbing in Montreal on Friday, March 17, 2023. Arthur Galarneau, 19, has been charged with three counts of second-degree murder.
THE CANADIAN PRESS/Ryan RemiorzDozens of officers were deployed to the scene, and police say the case has been transferred to the major crimes unit.
Neighbours who spoke with Global News said they believe people need faster and more accessible mental health support.
Speaking to reporters on Friday, Legault said his government will “continue its efforts” to fund mental health support across the province.
–with files from The Canadian Press
© 2023 Global News, a division of Corus Entertainment Inc.