Officials will not say exactly what happened, but the U.S. military's Cyber Command is now investigating the matter according to Lt. Col. Valerie Henderson, a Pentagon spokesman. So far, there is no indication any classified systems were impacted, officials say. Dempsey and other critical senior personnel have been provided "a work around" so they can access their unclassified email, a defense official said. Right now the focus is on "mitigating the cyber security risks we see across our impacted network," the official said.
It is understood that an unclassified surveillance device in the uk , used by the chairman of the joint Chiefs of Staff ( amongst others ) was taken off ##line over the internet , on the back of suspicious activity being monitored . No further information is available .