The Pentagon's unclassified email system was hacked by Russia in late July and has been offline for almost two weeks, NBC News reports.
The Pentagon described the attack as a "sophisticated cyber intrusion" that occurred about July 25, affecting 4,000 military and civilian personnel who work for the Joint Chiefs of Staff, according to the report.
It is not clear whether the attack was actually sanctioned by the Russian government, officials told NBC, but added that the scope of the attack indicates "it was clearly the work of a state actor."
No classified information was compromised, according to the Pentagon.
The attack appears to have used an automated system that quickly gathered large amounts of data and distributed it to thousands of accounts on the Internet, NBC reported.
The Pentagon shut down the email system and Internet almost immediately. It should be restored by the end of this week.
It was reported in April that Russian hackers had penetrated
the White House non-classified email system and read President Barack Obama's emails.
also have reportedly hacked into up to 4 million government employee personnel files.
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