The story

Computer hackers have embedded software in the United States' electricity grid and other infrastructure that could potentially disrupt service or damage equipment, two former federal officials told CNN.

The code in the power grid was discovered in 2006 or 2007, according to one of the officials, who called it "the 21st century version of Cold War spying."

Department of Homeland Security Director Janet Napolitano would not confirm such a breach, but said Wednesday that there has been no known damage caused by one. Read full article »

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