École Polytechnique massacre
After that, he moved to the second floor corridor and wounded three other students before he entered another room where he tried to shoot a female student twice but failed. He reloaded the gun in the emergency staircase and tried to enter the room that he left but the students locked the door. He attempted to unlock it with three gunshots but failed. He moved through the corridor where he shot wounded a student. He went to the financial services office and shot and killed a woman through the window of a door she had locked.