In a blunt admission designed to prod action, Defense Secretary Leon Panetta Thursday night told business executives there has been a sudden escalation of cyber terrorism and that attackers have managed to gain access to control systems for critical infrastructure.

In a speech in New York City, Panetta said the recent activities have raised concerns inside the U.S. intelligence community that cyber terrorism might be combined with other attacks to create massive panic and destruction on par with the Sept. 11, 2001 attacks.
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