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 The WARC files associated with this crawl are not currently available to the general public. ||||| U.S. officials tell NBC News that Russia launched a "sophisticated cyberattack" against the Pentagon's Joint Staff unclassified email system, which has been shut down and taken offline for nearly two weeks. According to the officials, the "sophisticated cyber intrusion" occurred sometime around July 25 and affected some 4,000 military and civilian personnel who work for the Joint Chiefs of Staff. 
 
 
 
 Sources tell NBC News that it appears the cyberattack relied on some kind of automated system that rapidly gathered massive amounts of data and within a minute distributed all the information to thousands of accounts on the Internet. The officials also report the suspected Russian hackers coordinated the sophisticated cyberassault via encrypted accounts on social media. 
 
 The officials say its not clear whether the attack was sanctioned by the Russian government or conducted by individuals. But, given the scope of the attack, "It was clearly the work of a state actor," the officials say. 
 
 
 
 They stressed that no classified information was seized or compromised and that only unclassified accounts and emails were hacked. 
 
 Read MoreMore than 21 million affected by OPM hack 
 
 
 
 Almost immediately after the cyberattack was detected, the Pentagon took the aggressive step of shutting down the entire Joint Staff unclassified email system and Internet during its investigation. The system should be back online before the end of this week. 
 
 This story is developing. Please check back for further updates.
– Officials believe Russian hackers are behind a cyberattack on the Pentagon's unclassified email system that has left approximately 4,000 employees of the Joint Chiefs of Staff without email for nearly two weeks, NBC News reports. The attack happened sometime in the last week of July, and while officials say no classified information was seized or compromised, the Pentagon was forced to shut down the entire Joint Chief email system. According to the Daily Beast, one defense official called it the "most sophisticated" attack yet on the network. The cyberattack was coordinated through social media, according to NBC News. And the Daily Beast reports it was carried out by sending emails that appeared to be legitimate but actually contained malware. Investigators believe the Russian hackers behind the attack are the same people behind similar attacks on the White House and State Department last year. NBC says it's unclear if the attack was backed by the Russian government, but CNBC cites one official who says the attack was "clearly the work of a state actor" based on its scope.