With today's deadly school shooting in Nevada, look back at other major school shootings in U.S. history.
Oct. 28, 2002: Failing University of Arizona Nursing College student and Gulf War veteran Robert Flores, 40, walked into an instructor’s office and fatally shot her. A few minutes later, he entered one of his nursing classrooms and killed two more of his instructors before fatally shooting himself.
Keystone Resort/Ben Lindbloom
Jessica Rinaldi / Reuters
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