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The killing of four or more people at a single location over a short period of time. This can be part of a shooting spree.
Ensure to adhere to acceptable definitions of mass murder before populating this category.
Mass murder is the act of murdering a large number of people, typically at the same time or over a relatively short period of time. Mass murder is also defined to be intentional and indiscriminate murder of large number of people by government agents. Examples are shooting of unarmed protestors, carpet bombing of cities, lobbying of grenades into prison cells, random execution of civilians." (see R. J. Rummel, Irving Louis Horowitz, Death by Government, Page 35, ISBN: 1560009276)
This category has the following 12 subcategories, out of 12 total.