The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) said Wednesday it is investigating a cybersecurity incident involving a standalone system, which senior Justice Department officials have designated a “major incident” under federal guidelines.

The disclosure comes as the Qilin ransomware group claimed ATF as a victim, according to cybersecurity outlets tracking the group’s leak site. The group has not publicly provided evidence substantiating its claim, and ATF has not attributed the incident to Qilin.

ATF said the affected system operates separately from its enterprise network and that there is no indication the incident affected…

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