Assertion: serial killer's murder | /r/HasProperty | separated by emotional cooling off period
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text: While mass murder is manifested in one catastrophic event, such as the mass public shooting in Las Vegas in 2017 or the Columbine High School massacre in 1999, and serial homicide involves at least three murders (and crime scenes) separated by an emotional cooling off period in between, spree killing is comprised of multiple homicides committed at two or more locations with almost no time break in between the events.