A man has died in Hong Kong after being hit on the head during clashes between government supporters and protesters.
The government said the 70-year-old cleaner was on a lunch break on Wednesday when he was struck by "hard objects hurled by masked rioters".
Meanwhile, China's president Xi Jinping said Hong Kong's use of "one country, two systems" was being "challenged".
And in London, Justice Secretary Teresa Cheng was hurt after being jostled by protesters, the Chinese embassy said.
China strongly condemned the incident and called for a thorough investigation.
What happened to the man?
The 70-year-old was hit in the head during a protest in the Hong Kong border town of Sheung Shui.
Video purported to be of the incident shows two groups throwing bricks at each other before the man falls to the ground after being struck on the head.
A police superintendent told news outlet SCMP that the cleaner was not involved, and was "only taking pictures at the scene". He died in hospital on Thursday.
The Food and Environmental Hygiene Department (FEHD) said the man was an outsourced worker of theirs who had been on his lunch break.