Four vehicles went up in flames at around 3:45 a.m. Friday in the Sud-Ouest borough.
According to Montreal police spokesperson Caroline Chèvrefils, the fires are believed to be criminal.
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Police say witnesses saw a man leaving the scene on Léa-Roback Street near Beaudoin Street.
According to Chèvrefils, two cars were originally targeted, but the fire spread to two other cars.
No injuries or evacuations were made.