Edward Snowden, who revealed he was the source of leaked information about US government surveillance programmes, denied having given classified information to China.
"I have had no contact with the Chinese government", Snowden said during a live chat on the Guardian website. "I only work with journalists".
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The families of all four of the victims, all of whom were men, have been informed, police said.
A motorcyclist from Nottingham has died in an accident at the Macau Grand Prix in China, earlier today.