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Has power grid been hacked? U.S. won’t say

WASHINGTON (Reuters) - U.S. concerns about the potential for cyber-attacks on critical infrastructure extended to the American electrical power grid on Wednesday and experts pointed the finger anew at Chinese hackers, among others.

U.S. Homeland Security Secretary Janet Napolitano told reporters the power grid is vulnerable to potentially disabling computer attacks, while declining to comment on reports that an intrusion had taken place.