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WASHINGTON, Oct 28 (Reuters) - Suspicious cyber activity has been detected on the computer network used by the White House and measures have been taken to address it, a White House official disclosed on Tuesday.
The official, who spoke on condition of anonymity, would not say who might have been responsible for the activity on what was described as an unclassified computer network used by employees of the Executive Office of the President.
"In the course of assessing recent threats we identified activity of concern on the unclassified EOP network. Any such activity is something that we take very seriously. In this case we took immediate measures to evaluate and mitigate the activity," the official said.
It was unclear when the activity took place. The official said the technical measures to address the activity had led to limited access to some EOP network services. Some of the issues have been resolved, but the work continues.
"Our actions are ongoing and some of our actions have resulted in temporary outages and loss of connectivity for some EOP users," the official said.
A second administration official said there were no indications at this time that classified networks had been affected.
The White House, like many government entities in Washington, frequently faces cyber threats. (Reporting By Steve Holland; Editing by Sandra Maler and Peter Cooney)
Department of Homeland Security Secretary Jeh Johnson is ordering more security for more than 9,500 federal government buildings and their 1.4 million daily visitors.
Johnson said in a statement Tuesday that the Federal Protective Service's new security measures are a precautionary guard against "continued public calls by terrorist organizations for attacks on the homeland and elsewhere" after two attacks last week on Canada's government.
But Johnson didn't reveal the details of the new security measures, saying they'll vary by location.
"The precise actions we are taking and the precise locations at which we will enhance security is law-enforcement sensitive, will vary and shift from location to location, and will be continually re-evaluated," Johnson said in the statement.
A Homeland Security official told CNN there is "no new intelligence" suggesting that U.S. government buildings face additional threats, and emphasized that the changes are a "precautionary measure" that only apply to buildings secured by the Federal Protective Service.