A man has died in Hong Kong after being hit on the head during clashes between government supporters and protesters.
Officials said the man, 70, was on a lunch break from his job as a cleaner when he was struck by "hard objects hurled by masked rioters".
It comes as China's President Xi Jinping said the "one country, two systems" system was being "challenged".
Justice Secretary Teresa Cheng was seriously hurt, Hong Kong officials said, after being jostled in London.
China strongly condemned the incident and called for a thorough investigation.
Hong Kong has been dogged by more than five months of political unrest.
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