ShinyHunters, a prolific cybercriminal group known for large-scale data theft and extortion, says it has breached the FBI and stolen data on thousands of agents and applicants. The hackers made the claim on theirdark webleak site, which TechCrunch reviewed, saying they had stolen “sensitive data on almost all FBI agents and individuals who filed an application with the FBI for a job.”

404 Mediafirst reportedon the breach after receiving a sample of the stolen names, home addresses, and phone numbers of FBI agents and their spouses, and verifying a portion of the stolen data against public records. The hackers say their hack is “not financially motivated,” and are demanding that the FBI removea reportthat they say contains false allegations about the group.

The independent publication said the hackers breached an Oracle PeopleSoft server, often used by human resources and recruiters to store job applicants’ personal information, then pivoted to breach an Amazon-hosted government cloud storing the agents and applicants’ data.

ShinyHunters told the publication that they took terabytes of data but did not say what they would do with the information if the FBI does not take down its published report. The stolen data could present a major counterintelligence threat, in which hackers and overseas spies use the information to coerce or extort FBI agents and their families into cooperating with a foreign government.

The hackers reportedly defaced the FBI’s jobs site, whichshowed at the time of publicationthat the portal was “currently down for maintenance.” The site also said that the FBI’s special agent applicant portal was also down.

The FBI did not respond to a request for comment about the incident on Tuesday, and neither did the ShinyHunters hackers.

This isthe second known breachof an FBI system this year after unidentified hackers broke into one of the agency’s systems for managing real-time wiretaps and foreign intelligence-gathering warrants, which could have identified targets of the agency’s surveillance. Separately, FBI director Kash Patel also had his personal email accounthacked and leakedby an Iran-backed hacking group called Handala in retaliation for U.S.-led strikes against Iran.