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ATF cyberattack and investigative system shutdown

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The Bureau of Alcohol, Tobacco, Firearms and Explosives shut down a breached standalone system containing information about targets of ATF investigations, creating a limited loss of an internal investigative resource while the agency retained its broader mission capability. Qilin later began publishing files that CNN and an independent researcher said appeared to contain ATF investigative material. ATF has not authenticated the files or attributed the incident, and no public evidence establishes ransomware encryption.

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