The State Department has shut down its entire unclassified email system after a suspected hacker attack, the latest in a string of federal agencies to suffer a security breach.
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A senior State Department official told Fox News on Sunday that the department recently detected “activity of concern” in its unclassified system, but its classified system was not compromised.

The Associated Press reported the incident occurred 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 U.S. Postal Service and the National Weather Service, have reported attacks.