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• Dec. 6, 1989: Marc Lepine, 25, bursts into Montreal’s Ecole Polytechnique college, shooting at women he encounters, killing nine and then himself.

• Aug. 19, 1987: Michael Ryan, 27, kills 16 people in small market town of Hungerford, England, and then shoots himself dead after being cornered by police.

• July 12, 1976: Edward Charles Allaway, a custodian in the library of California State University, Fullerton, fatally shot seven fellow employees and wounded two others.

• Aug. 20, 1986: Pat Sherrill, 44, a postal worker who was about to be fired, shoots 14 people at a post office in Edmond, Okla. He then kills himself.

• July 18, 1984: James Oliver Huberty, an out-of-work security guard, kills 21 people in a McDonald’s restaurant in San Ysidro, Calif. A police sharpshooter kills Huberty.

• Aug. 1, 1966: Charles Whitman opened fire from the clock tower at the University of Texas at Austin, killing 16 people and wounding 31.