The student would be best identified as a mass murderer.
Mass murder is the act of killing many people, usually all at once or all within a short period of time and in the same general area. According to the US Congress, a mass murder occurs when three or more persons are killed simultaneously without a "cooling-off" period in between.
Typically, a mass murder takes place in one place, where one or more people kill a number of others.
In contrast to spree killings, which are often carried out by one or two people, mass murders can be conducted by both individuals and groups.
Mass murderers are different from spree killers, who kill at two or more locations with little or no time break at all between murders and are usually not defined by the number of victims, and serial killers, who may kill people over long periods of time.
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