Chinese Hacked Obama, McCain Campaigns, Took Internal Documents, Officials Say

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U.S. President-elect Barack Obama (R) meets with former Republican presidential candidate Arizona Senator John McCain at Obama's transition offices in Chicago on November 17, 2008. (SAUL LOEB/AFP/Getty Images) | Getty File

The U.S. secretly traced a massive cyberespionage operation against the 2008 presidential campaigns of Barack Obama and John McCain to hacking units backed by the People’s Republic of China, prompting high level warnings to Chinese officials to stop such activities, U.S. intelligence officials tell NBC News.

Read the whole story at NBC News