Washington: The US State Department has taken the unprecedented step of shutting down its entire unclassified email system as technicians repair possible damage from a suspected hacker attack.
A senior department official said Sunday that "activity of concern" was detected in the system around the same time as a previously reported incident that targeted the White House computer network. That incident was made public in late October, but there was no indication then that the State Department had been affected. Since then, a number of agencies, including the US Postal Service and the National Weather Service, have reported attacks.
The official said none of the State Department's classified systems were affected. However, the official said the department shut down its worldwide email late on Friday as part of a scheduled outage of some of its Internet-linked systems to make security improvements to its main unclassified computer network. The official was not authorised to speak about the matter by name and spoke on condition of anonymity.
The official said the department expects that all of its systems will be operating as normal in the near future, but would not discuss who might be responsible for the breach. Earlier attacks have been blamed on Russian or Chinese attackers, although their origin has never been publicly confirmed.
The State Department is expected to address the shutdown once the security improvements have been completed on Monday or Tuesday.
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