A hacker is claiming to have stolen names, job titles, email addresses and phone numbers on close to 30,000 officials at the Department of Homeland Security and Federal Bureau of Investigation.

The information came with more than 200 gigabytes of data the hacker claimed he was able to steal by hacking a computer at the Department of Justice, according to a report published in Motherboard on Sunday. Shortly after its publication, the perpetrator released data on 9,000 alleged DHS employees via Twitter.