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A mass murder (massacre) involves the murder of large numbers of people either by a state or an individual. This should not be confused with serial killers, who usually tend to kill one person (or perhaps two) at a time.
The largest mass killings in history have been attempts to exterminate ethnic and other groups; for more about this subject see genocide. This article refers to non-genocidal mass killings.
Although "genocide" does not necessarily require actual killing, only acting on a plan to exterminate an ethnic group, mass murder by definition involves killing a large number of people.
R. J. Rummel, a political scientist, coined the word democide to cover mass murder by a state. Some killings commonly viewed as genocide are actually democide or mass murder because they involve killing for political or cultural reasons.
Examples include:
Some people also regard the bombing of urban areas during wartime to constitute mass murder by the state.
In recent years, terrorists have performed acts of mass murder as acts of intimidation, and to draw attention to their causes. Examples of major terrorist incidents involving mass murder include:
It should be noted that many of these are very much American examples; in fact, the USA is relatively untouched by mass terrorist killings (when compared to Northern Ireland, the Basque region of Spain, Chechnya, Indonesia and the like).
Outside of a political context, the term "mass murder" refers to the killing of several people at the same time. Examples would include shooting several people in the course of a robbery, or setting a crowded nightclub on fire. This is an ambiguous term, similar to serial killing and spree killing. The USA Bureau of Justice Statistics defines a mass murder as: "[involving] the murder of four or more victims at one location, within one event." Most mass murderrers fall into one of three categories: family annihilators, firearms enthusiasts or disgruntled workers.
In addition, Brenda Ann Spencer attempted a mass murder at an elementary school in San Diego, California, 1979. She only killed two people guarding the students that she targeted. Eight students and a police officer were injured.
The wrongful killing of large numbers of civilians or prisoners during war is called a war crime although it may also be genocide if the proper ethnic motivation is present as in the killings which occurred in the breakaway republics of the former Yugoslavia or in the killing of the Pequot in colonial America.