Story highlights Hackers published contact information for 20,000 FBI employees Monday afternoon

The Justice Department is actively investigating the incident

Washington (CNN) Hackers, making good on a threat, published contact information for 20,000 FBI employees Monday afternoon, just one day after posting similar data on almost 10,000 Department of Homeland Security employees.

The hackers, tweeting from the account @DotGovs, claim they obtained the details by hacking into a Department of Justice database.

The hackers boasted on Twitter, "FBI and DHS info is dropped and that's all we came to do, so now its time to go, bye folks! #FreePalestine."

The information contained names, titles, phone numbers and email addresses. After the hackers published the data on the DHS employees on Sunday, they tweeted, "Well folks, it looks like @TheJusticeDept has finally realized their computer has been breached after 1 week."

The Justice Department is investigating the hack.

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