A hacker infiltrated one of the Pentagon's e-mail servers, which caused security staff to take up to 1,500 accounts offline to deal with the problem. A spokesman for the Pentagon said the e-mail system did not contain top-secret information relating to military operations, but would not confirm if the hacker was able to read e-mails.
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According to officials, the attack could have originated from a variety of sources including casual hackers, cyber vigilantes and ideological groups or possibly nation states.
Raimund Genes, CTO at security provider Trend Micro, said that the increased digitisation of assets makes government targets in particular vulnerable to attack and that shoring up security was a top priority for many departments.
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