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Hackers claiming affiliation with the Islamic State in Iraq and Syria (ISIS) on Saturday published personal details of 100 U.S. military personnel and urged violence against them.

The New York Daily News reported that a group called the “Islamic State Hacking Division” was behind the leak. It contains names, pictures, addresses and unit identification numbers for American service members allegedly involved in bombings against ISIS.

The New York Times said Saturday that both Defense Department and F.B.I. officials are investigating the post. One Defense spokesperson, not authorized to speak publicly, refuted the hackers’ claims that they compromised military servers.