Just as Congress weighs a bill that would give the government control over an unspecified range of private-sector cybernetworks in case of attack, anonymous national security officials told The Wall Street Journal that Chinese and Russian spies have breached the U.S. power grid. In a rare moment of disclosure on a typically hushed topic, officials noted that it is intelligence agencies, not the private-sector owners of the infrastructure, that often detect cyberthreats. The Obama administration is considering asking Congress to add private networks to a cyberprotection program that was funded secretly under the Bush administration.

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