Police initially looked for as many as three suspects, but Montreal Police Chief Yvan Delorme later confirmed that there was only one shooter, who was shot and killed on the scene.
Politiet ledte til at begynde med efter tre mistænkte, men Montreals politichef Yvan Delorme har senere bekræftet at der kun var en gerningsmand og at han var blevet skudt og dræbt af politiet.