"An aggressor nation or extremist group could use these kinds of cyber tools to gain control of critical switches. They could derail passenger trains, or even more dangerous, derail passenger trains loaded with lethal chemicals. They could contaminate the water supply in major cities, or shut down the power grid across large parts of the country."
US Defense Secretary Leon E. Panetta

Panetta Warns of Dire Threat of Cyberattack on U.S.
New York Times October 11, 2012

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