A hacker attacked the Pentagon and penetrated in the email system and as a result the defense officials put 1,500 accounts off-line.
"All precautionary measures are being taken and we expect this system to be on-line again very soon," said Colonel Gary Keck, a Pentagon spokesman.

The Colonel said that the attack was detected in the unclassified email system of the office of the secretary of defense. Between 1,000 and 1,500 users of the system were taken off-line.

The attack was not a threat to national security because the system that was penetrated carries administrative emails and not classified information related to military operations. The source of the attack was not commented and was not said if the hacker was able to read the emails.

"The department has redundant systems in place and there is no anticipated adverse impact to ongoing operations," the spokesman said. "The department aggressively monitors its networks for intrusions and has appropriate procedures to address events of this nature."

We hope that this will not happen again, and Pentagon will secure it's systems better because in the end it's a matter of national security.