ATF investigates ‘major’ cybersecurity incident as ransomware group claims attack

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 the ATF has not attributed the incident to Qilin.