The US should provide the international community with "a necessary explanation" about the Prism surveillance programme, China's foreign ministry said today.
Ministry spokeswoman Hua Chunying said the US should pay attention to the concerns and demands of the international community.
When asked whether National Security Agency whistleblower Edward Snowden - who is currently in Hong Kong - was a spy of China, Hua said that was "utterly ridiculous".
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It is claimed that both police and security services, including MI5, have been prevented from vast pools of data on the social media site.