China Has Been Reading White House Email since 2010

China's cyber spies have accessed the private emails of "many" top Obama administration officials, according to a senior U.S. intelligence official and a top secret document obtained by NBC News, and have been doing so since at least April 2010. The email grab -- first codenamed "Dancing Panda" by U.S. officials, and then "Legion Amethyst" -- was detected in April 2010, according to a top secret NSA briefing from 2014. The intrusion into personal emails was still active at the time of the briefing and, according to the senior official, is still going on.