The building housing Unit 61398 of the PLA (top), on the outskirts of Shanghai, is where a US security firm said it had traced cyberattacks on American companies to. Photo: AP

NSA may have undercover agents in mainland companies

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The building housing Unit 61398 of the PLA (top), on the outskirts of Shanghai, is where a US security firm said it had traced cyberattacks on American companies to. Photo: AP
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