noun
A person who is actively engaged in killing or attempting to kill people in a confined and populated area
adjective
Describing someone or something that is engaged in or likely to engage in violent behavior
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The police are currently responding to reports of an active shooter in the area.
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There's news of an active shooter nearby, stay safe!
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Dude, did you hear about the active shooter situation happening right now?
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In the world of cybersecurity, an active shooter can be compared to a malicious hacker trying to breach a system.