China says U.S. hacking accusations lack technical proof

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A Chinese People's Liberation Army soldier stands guard in front of 'Unit 61398', a secretive Chinese military unit, in the outskirts of Shanghai, February 19, 2013. The unit is believed to be behind a series of hacking attacks, a U.S. computer security company said, prompting a strong denial by China and accusations that it was in fact the victim of U.S. hacking. REUTERS/Carlos Barria