Thousands of FBI and law enforcement officials could be at risk after having their personal data stolen and published by a group of anonymous hackers, according to a new report.

The hackers accessed three websites affiliated with the FBI National Academy Associates, a nonprofit education and training program for law enforcement officials located near the FBI Academy in Quantico, Va., according to TechCrunch.

The stolen data includes around 4,000 member records, including names, email addresses, job titles, phone numbers, and mailing addresses of federal agents and law enforcement officials. The hackers claimed to have stolen “over a million” pieces of data from the breach.

The hackers claim they plan to sell the data on the dark web, and have also posted some of it on their own websites for free to drum up interest from potential buyers and advertise the “interesting” nature of the content.

When asked if the information would put law enforcement officials at risk, one of the hackers told TechCrunch, “Probably, yes.”

“We hacked more than 1,000 sites,” the hacker said. “Now we are structuring all the data, and soon they will be sold. I think something else will publish from the list of hacked government sites.”

The hacker said the group was able to access the information through security vulnerabilities in the websites, and claimed to have stolen the information in order to gain “experience and money.”