A hacktivist group known as the Department of Peace claimed responsibility for obtaining and leaking personal data on more than 41,000 Department of Homeland Security employees and contractors.

The data, published Wednesday by the transparency nonprofit Distributed Denial of Secrets under the name "Icepick," includes names, job titles, phone numbers, email addresses, and internal group memberships that reveal sensitive assignments. These details cover employees across DHS components such as Customs and Border Protection, Immigration and Customs Enforcement and its Homeland Security Investigations unit, the Cybersecurity and Infrastructure Security Agency, and U.S. Citizenship and Immigration Services.

Customs and Border Protection accounts for the largest share with roughly 21,000 records. Immigration and Customs Enforcement follows with about 10,000 entries. The leak exposes contact information for personnel involved in surveillance, special operations, computer forensics, and undercover work, including some ICE agents.

The hackers said they accessed the information by exploiting DHS's use of Okta's single sign-on service. They framed the action as retaliation against stepped-up immigration enforcement, citing DHS Secretary Markwayne Mullin's July comments about "turning up the heat" on ICE operations.

This incident marks the latest in a series of cyberattacks targeting federal agencies. Breaches at the Pentagon and FBI occurred in recent weeks.

Distributed Denial of Secrets co-founder Emma Best described the archive as identifying officials responsible for covert operations and deportation programs. The group made the data searchable online.

DHS has not issued a public statement confirming the breach or detailing any response. The exposure raises concerns about the safety of frontline personnel enforcing immigration laws and securing the border.