The US Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) is responding to a "major" cybersecurity incident after the Russia-linked Qilin ransomware gang claimed responsibility, posting the agency on its leak site. ATF states that the breach was limited to a standalone computer system containing investigation target information, with no impact on its broader network or operations. The Department of Justice has designated the compromise a "major incident," and an investigation is ongoing, with ATF declining to provide further details.
