Emergency personnel were called to a home at 14 Rue de Gaspé Saturday morning for a house fire.
Firefighters doused the blaze but a body was later found inside the home.
Police have not disclosed the identity or gender of the victim but the family was notified, they said. Neighbours said a woman lived in that home.
It is not clear if the victim found in the home was killed in the fire or already dead.
Police later said evidence showed the fire was set on purpose.
On Saturday night, police found a 2004 Pontiac Sunfire they called a vehicle of interest in the case. They have not said who owns the vehicle or where it was found.
Forensic teams are also returning to the home Tuesday for further analysis. It remains cordoned off.Suggest a correction