04/18/2012 06:31 am ET

Cybersecurity Warning: Several Nations Trying To Penetrate U.S. Networks, Ex-FBI Official Says

At least half a dozen countries with offensive cyber-capabilities are probing U.S. corporate and military computer systems, looking for data and a toehold should they one day want to disrupt or destroy the networks, according to the FBI’s former top cyber-sleuth.

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