Defined as the perpetrator of an ongoing mass shooting, active shooter events require coordinated prevention, rapid response, and crisis management to protect public safety and prevent mass casualties. This list compiles information on incidents, policies, and recommendations.
WARNING: Documents in the Restricted Collection are CONTROLLED UNCLASSIFIED INFORMATION (CUI) or UNCLASSIFIED//FOR OFFICIAL USE ONLY (U//FOUO).
They contain information that may be exempt from public release under the Freedom of Information Act (5 U.S.C. 552). They are to be controlled,
stored, handled, transmitted, distributed, and disposed of in accordance with DHS policy [pdf] relating to CUI or FOUO information and are not
to be released to the public, the media, or other personnel who do not have a valid "need-to-know" without prior approval of an authorized DHS
official. No portion of these reports should be furnished to the media, either in written or verbal form. More rules for use / help with this
section.
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