Planning and Response to an Active Shooter - CISA
https://www.cisa.gov/sites/default/files/publications/Planning%20and%20Response%20to%20an%20Active%20Shooter_2021.pdf
In this document, we use the Federal Bureau of Investigation (FBI)’s definition of an active shooter: “An individual actively engaged in killing or attempting to kill people in a populated area.” 4. Active shooter incidents are dynamic and quickly evolve. In active shooter cases, firearms are the weapon of choice, but
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