Crime Library: Criminal Minds and Methods
Mass and Spree Murders of 2012
 
 
Spree Murder: two or more murders committed by one or more offenders, in separate incidents, without a cooling-off period.

Mass Murder: a number of murders committed by one or more offenders, at about the same time, during a single incident, which may be short or prolonged, often at a single location or general area.

Definition source: www.fbi.gov
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