National security officials in the U.S. say the electricity grid has been penetrated by spies who have left software tools behind that could destroy parts of the infrastructure. They say there is no immediate danger, but note that sewage and water systems are at risk along with the grid. "Over the past several years, we have seen cyberattacks against critical infrastructures abroad, and many of our own infrastructures are as vulnerable as their foreign counterparts," said Dennis Blair, director of national intelligence.

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