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Malicious virus shuttered U.S. power plant -DHS --DHS refuses to name plant 16 Jan 2013 A computer virus attacked a turbine control system at a U.S. power company last fall when a technician unknowingly inserted an infected USB computer drive into the network, keeping a plant off line for three weeks, according to a report posted on a U.S. government website. The Department of Homeland Security report did not identify the plant but said criminal software, which is used to conduct financial crimes such as identity theft, was behind the incident. It was introduced by an employee of a third-party contractor that does business with the utility, according to the agency. DHS reported the incident, which occurred in October, along with a second involving a more sophisticated virus, on its website.