With Tuesday's school shooting in Oregon, look back at other major school shootings in U.S. history.
Nov. 1, 1991: Gang Lu, 28, a graduate student in physics from China, opened fire in two buildings on the University of Iowa campus. Five university employees were killed and two other people were wounded. The student fatally shot himself.
Enrique Castro-Mendivil / Reuters
U.S. National Archives
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