The former FBI boss James Comey has said he is innocent and welcomes a trial after being indicted on two criminal charges. Donald Trump has been seeking retribution after the FBI investigated his 2016 presidential campaign over possible ties to Russia. Also: TikTok avoids shut down with US operations to be handed to a group of investors, use of the party drug mephedrone soars in Russia, and new research suggests humans may have evolved half a million years earlier than previously thought.

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