Defense secretary Leon Panetta says cyberattacks against critical infrastructure at home and abroad--some of which he called the worst to date--should spark urgent action against the hacker threat.
Hackers have infiltrated the control systems of U.S. critical infrastructure--systems that operate chemical, electricity, and water plants--and the need to develop new cyber capabilities and put in place effective policy to fight and deter attacks is as urgent as ever, secretary of Defense Leon Panetta said in a speech Thursday night.

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