Hackers calling themselves the "Department of Peace" hacked the U.S. Department of Homeland Security (DHS) and leaked contract data between Immigration and Customs Enforcement (ICE) and 6,000 companies, TechCrunch reported on Monday.

The data was published by the nonprofit transparency group DDoSecrets. It included data linked to defense firms Anduril, L3Harris and Raytheon, surveillance firm Palantir, as well as Microsoft and Oracle.

The hackers claimed they took the data from the Office of Industry Partnerships, the DHS unit responsible for private-sector technology procurement. DHS and ICE did not issue an official position. The hackers cited the deaths of two protesters in Minneapolis as the reason for the attack, saying, "DHS is killing us, and people should know about the companies that support it and what they do."

Security researcher Micah Lee compiled the leaked data on a separate website to make it searchable. The disclosed information included contractor names, contract amounts, and the names, emails and phone numbers of people in charge. The largest contract was worth $70 million and was won by Cyber Apex Solutions, while Science Applications International Corp. (SAIC) and Underwriters Laboratories also signed contracts worth $59 million and $29 million, respectively. The companies did not respond to requests for comment.