Patrolling officers were alerted to the fire around midnight by a witness.
A tutoring centre offering courses in mathematics and English in Pierrefonds was targeted by a firebomb early Monday.
Damage to the business was slight and there were no reported injuries or arrests.
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Patrolling officers were alerted to the fire around midnight by a witness who said they had seen flames inside the small commercial building on St-Charles Blvd. near Pierrefonds Blvd.
Firefighters were called to the scene and the flames were quickly extinguished. The building’s front window had been shattered and the remains of a firebomb were found inside.
The investigation has been assigned to the arson squad.