The arson squad is investigating after a Molotov cocktail was hurled at the ground floor of a commercial/residential building in Rosemont.

An alarm went off at 3:50 a.m. Wednesday when the front window was shattered, and a Molotov cocktail tossed into the store.

Firefighters were quick to arrive at the scene, and were able to limit damage to the front of the building located at 2565 Belanger, near Molson.

Nobody was injured in the attack, and none of the apartments above the store were damaged in any way.

Investigators are gathering evidence to determine who pitched the incendiary device into the new store, which was reportedly set to open soon for business.