École Polytechnique massacre
He entered the building sometime at 4 p.m. on December 6, 1989 with a Ruger Mini-14 rifle and hunting knife. After he entered a second floor mechanical engineering class of about sixty students at about 5:10 p.m., he approached a student that was giving a presentation. He ordered that everyone stop what they were doing and both men and women to go to opposite sides of the classroom. Nobody moved at first, believing it to be a joke until he fired a shot into the ceiling. He killed six women and wounded three others there.