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1.
One or more subjects who participate in a shooting spree, demonstrating their intent to continuously harm others.  Their overriding objective appears to be mass murder, rather than other criminal conduct, such as robbery, hostage taking, etc.  
The first officers on scene engaged the ACTIVE SHOOTER in the main hallway of the school.
by Shane E Smith April 26, 2007

Words related to Active Shooter

extremist hostage killing spree shooting terrorist