The United States Federal Bureau of Investigation confirmed Wednesday it is investigating a cyberattack targeting its jobs website, fbijobs.gov. A hacking group known as ShinyHunters has claimed responsibility for the breach, alleging they have obtained "very sensitive" personally identifiable information on thousands of FBI employees.

The agency stated it is "actively and aggressively investigating this matter" and working with third-party providers supporting the portal to mitigate risks. The FBI acknowledged awareness of the cybercriminal group's claims regarding the alleged compromise and impact on employee data. The exact point of the breach, whether internal or via a third-party vendor, remains undetermined.

News outlets, including Reuters, reported seeing portions of the data, which ShinyHunters claims amounts to between two and three terabytes. According to Reuters, the stolen information includes detailed job assignments for numerous bureau officials, with specific mentions of sensitive work against entities like Chinese spies, Russian intelligence, and drug cartels.

ShinyHunters stated on Tuesday that it breached the FBI and stole data from a large number of current and former employees. The group has indicated they are holding the data hostage, demanding the FBI rescind a statement issued in May that characterized ShinyHunters as "threat actors." The group also said Wednesday it was attempting to prevent the personnel information from circulating widely.

In its May statement, the FBI described ShinyHunters as actors who frequently harass or threaten victims, leveraging "real or exaggerated claims of access to sensitive or personal information to prompt payment." The bureau cautioned that these groups "may falsely claim to have sensitive or compromising information, including embarrassing photographs or videos of victims, which frequently do not exist."

The FBI has been a frequent target of cyberattacks. In March, the agency disclosed an investigation into "suspicious activities" on an internal system holding sensitive data related to surveillance operations and investigations. Also in March, a pro-Iranian hacking group claimed to have compromised an account belonging to FBI Director Kash Patel, posting what appeared to be years-old photographs, a resume, and other personal documents online.

This latest incident highlights ongoing cybersecurity challenges faced by federal law enforcement agencies. The FBI's investigation will aim to determine the full scope of the breach, identify the perpetrators, and assess the extent of compromised employee data.

Further details regarding the investigation's progress and any confirmed data loss are expected to be released by the FBI as the probe continues. The agency's response underscores the sensitivity of data handled by intelligence and law enforcement bodies and the persistent threat posed by sophisticated hacking operations.