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How dangerous could a cyber-war with China be for the US?

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A U.S. security firm has exposed the role of the Chinese military in an overwhelming number of cyber-attacks on U.S. infrastructure, government agencies, and corporations, resulting in the theft of information from military contractors and energy companies. NBC News' Andrea Mitchell discusses the report's findings with Mandiant Vice President Grady Summers and Chris Johnson of the Center for Strategic and International Studies.