The hacker group, which calls itself CyberCaliphate, appears to be the same one that is under FBI investigation for hijacking the websites or Twitter feeds of media outlets in the last month, including a Maryland television station and a New Mexico newspaper.

Defense officials said Monday that they have been in contact with the FBI, and that the previous breaches by the group raises questions about whether the hackers have any real connection to the Islamic State militants that are under U.S. and coalition attack in Iraq and Syria.