The U.S. Department of Homeland Security defines an "active shooter" as an "individual actively engaged in killing or attempting to kill people in a confined and populated area. Learn what to do if you find yourself in an active shooting event, how to recognize signs of potential violence around you, and what to expect after an active shooting takes place.
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Run, Hide, and (as a last resort) Fight
RUN and escape, if possible:
HIDE if you can’t escape:
FIGHT only as a last resort:
(sources: Ready.gov, Homeland Security)