Pentagon computer burglarized Russian Hacker

the US government was forced to turn off the email system used in the Pentagon computer because hackers compromised network. Email system is used by the US Department of Defense joint staff with offices in the building.
Cyber ​​attacks that occurred on July 25 last and affecting some 4,000 people, both civilian and military, who worked at the Joint Chief of Staff. And since then the US Department of Defense was forced offline-right clicking the email system.
A source said that the cyber attacks were believed to come from Russia, and to use an automated system that suck up huge amounts of data from email systems. Then the data is distributed to thousands of other accounts in cyberspace.
The same source also mentions that the Russian hackers using social media to coordinate with each other. Although not clear whether the attack was carried out by the Russian government or individually.
But certainly, when seen from the massive attacks, the US government's unnamed alleged that the attack may be done by the government, quoted by CNBC, Monday (08/10/2015).
Fortunately burglarized email system was not used to transmit confidential data. And the US government call no confidential information is leaked in the attack.