Part of Pentagon email network taken down over suspicious activity

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An unclassified email network used by Army General Martin Dempsey and other members of the U.S. military's Joint Staff has been taken off line because of suspicious activity, a Pentagon spokeswoman said on Tuesday.

Army Lieutenant Colonel Valerie Henderson said the unclassified email network for all users on the Joint Staff was taken offline by the Defense Department because of suspicious activity noted over the weekend and is "currently down."

"We continue to identify and mitigate cybersecurity risks across our networks," Henderson said. "With those goals in mind, we have taken the Joint Staff network down and continue to investigate."

Henderson did not specify the nature of the suspicious activity on the network. She said the network was taken offline by the department, not by the activity or any outside party.

(Reporting by Sandra Maler and David Alexander; Editing by Eric Walsh)

Related images from the US Office of Personnel Management data hack:

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Part of Pentagon email network taken down over suspicious activity
Katherine Archuleta, director of the Office of Personnel Management, listens during a hearing of the Senate Homeland Security and Governmental Affairs Committee on Capitol Hill June 25, 2015 in Washington, DC. Witnesses testified about the hacking of Office of Personnel Management data. (Photo credit: BRENDAN SMIALOWSKI/AFP/Getty Images)
From left Katherine Archuleta, director of the Office of Personnel Management, US Chief Information Officer Tony Scott, Assistant Homeland Security Secretary for National Protection and Programs Andy Ozment, and McFarland, inspector general of the Office of Personnel Management, are sworn in during a hearing of the Senate Homeland Security and Governmental Affairs Committee on Capitol Hill June 25, 2015 in Washington, DC. Witnesses testified about the hacking of Office of Personnel Management data. AFP PHOTO/BRENDAN SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
UNITED STATES - JUNE 23 - Katherine Archuleta, director, Office of Personnel Management, testifies during a Senate Appropriations Financial Services and General Government Subcommittee hearing to review data security and information technology spending at the Office of Personal Management on Capitol Hill on Tuesday, June 23, 2015. (Photo By Al Drago/CQ Roll Call)
WASHINGTON, DC - JUNE 23: Katherine Archuleta, director of Office of Personnel Management, arrives for a Senate Appropriations Financial Services and General Government Subcommittee hearing to review information technology spending and data security at the U.S. Office of Personnel Management, on Capitol Hill, June 23, 2015 in Washington, DC. FBI Director James Comey recently told Senators in a closed-door meeting that the personal data of an estimated 18 million current and former federal employees were affected by a recent cyber breach at the Office of Personnel Management. (Drew Angerer/Getty Images)
White House Press Secretary Josh Earnest answers questions on the massive cyber-attack on the personal data of government employees June 5, 2015 during the daily briefing in the Brady Briefing Room of the White House in Washington, DC. The US government on Thursday admitted hackers accessed the personal data of at least four million current and former federal employees, in a vast cyber-attack suspected to have originated in China. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
White House Press Secretary Josh Earnest answers questions on the massive cyber-attack on the personal data of government employees June 5, 2015 during the daily briefing in the Brady Briefing Room of the White House in Washington, DC. The US government on Thursday admitted hackers accessed the personal data of at least four million current and former federal employees, in a vast cyber-attack suspected to have originated in China. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
White House Press Secretary Josh Earnest answers questions on the massive cyber-attack on the personal data of government employees June 5, 2015 during the daily briefing in the Brady Briefing Room of the White House in Washington, DC. The US government on Thursday admitted hackers accessed the personal data of at least four million current and former federal employees, in a vast cyber-attack suspected to have originated in China. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
WASHINGTON, DC - JUNE 05: The Theodore Roosevelt Federal Building that houses the Office of Personnel Management headquarters is shown June 5, 2015 in Washington, DC. U.S. investigators have said that at least four million current and former federal employees might have had their personal information stolen by Chinese hackers. (Photo by Mark Wilson/Getty Images)
WASHINGTON, DC - JUNE 05: The entrance to the Theodore Roosevelt Federal Building that houses the Office of Personnel Management headquarters is shown June 5, 2015 in Washington, DC. U.S. investigators have said that at least four million current and former federal employees might have had their personal information stolen by Chinese hackers. (Photo by Mark Wilson/Getty Images)
WASHINGTON, DC - JUNE 05: The Theodore Roosevelt Federal Building that houses the Office of Personnel Management headquarters is shown June 5, 2015 in Washington, DC. U.S. investigators have said that at least four million current and former federal employees might have had their personal information stolen by Chinese hackers. (Photo by Mark Wilson/Getty Images)
The American flag is reflected in a window at the Theodore Roosevelt Building, headquarters of the U.S. Office of Personnel Management (OPM), in Washington, D.C., U.S., on Friday, June 5, 2015. The disclosure by U.S. officials that Chinese hackers stole records of as many as 4 million government workers is now being linked to the thefts of personal information from health-care companies. The hackers, thought to have links to the Chinese government, got into the OPM computer system late last year, according to one U.S. official. Photographer: Andrew Harrer/Bloomberg via Getty Images
Vehicles drive past the Theodore Roosevelt Building, headquarters of the U.S. Office of Personnel Management (OPM), in Washington, D.C., U.S., on Friday, June 5, 2015. The disclosure by U.S. officials that Chinese hackers stole records of as many as 4 million government workers is now being linked to the thefts of personal information from health-care companies. The hackers, thought to have links to the Chinese government, got into the OPM computer system late last year, according to one U.S. official. Photographer: Andrew Harrer/Bloomberg via Getty Images
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