[[List of instances of armed citizens stopping active shooters]] - article posted.
[[List of instances of armed citizens stopping active shooters]] - article posted.
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==Spree killers and mass killings==
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The [[Federal Bureau of Investigation|FBI]] defines "mass killings as "three or more killings in a single incident".<ref name="natrev">[https://www.nationalreview.com/2018/05/fbi-active-shooter-data-shows-importance-of-armed-citizens/ New FBI Data on Active Shooters Shows the Importance of Armed Citizens], ''National Review'' May 25, 2018</ref> A spree killer is someone who kills two or more victims in a short time, in multiple locations.<ref name="wikipedia">[https://en.wikipedia.org/wiki/Spree_killer (definition in Wikipedia)]</ref>
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==Incidents in which an armed citizen stopped an active shooter==
==Incidents in which an armed citizen stopped an active shooter==