A sample of 5,000 alleged agents seen by 404 Media includes names, addresses, phone numbers, and details on FBI employees' spouses.

A high profile hacking group claims it has breached multiple FBI-related services and stolen data “on all FBI employees and applicants.” A representative of the group, called ShinyHunters, told 404 Media the data includes FBI agents’ names, home addresses, phone number, and information on their spouse.

The data breach could be massively significant and may have all sorts of national security and counterintelligence implications. Criminals from the same ecosystem as ShinyHunters have previously used hacked data like phone records to track, intimidate, and harass the FBI agents investigating them. The highly sensitive data could also be a boon to foreign intelligence agencies who want to better understand how one of the most important law enforcement and intelligence agencies in the U.S. operates. And if the data fell into the hands of more criminals, FBI agents and their spouses could face serious threats to their safety.

“We hacked the FBI. We hold data on all FBI employees and applicants,” the representative of the group told 404 Media.

The representative provided 404 Media with a sample appearing to contain the personal data of 5,000 FBI employees. That data included an alleged address, phone number, date of birth, and in some cases details on their spouse.