Masked men attacked passengers after storming a train station in Hong Kong's Yuen Long district on Sunday.
Police say dozens of people are injured with one person in critical condition.
It comes after the latest pro-democracy rally in the centre of Hong Kong.
Demonstrations were also protesting against a controversial bill that allows extraditions to mainland China.
It's still unclear who the mob was or why the attacked the passengers.
Israel launches airstrikes on south Lebanon
The Israeli military carried out heavy airstrikes on south Lebanon on Thursday after issuing evacuation orders for three locations, saying Lebanese armed group Hezbollah was trying to rebuild its military capabilities there.
Voting ends in first phase of election in India's Bihar
The first phase of the assembly elections in the Indian state of Bihar has concluded, covering 121 constituencies across 18 districts.
Britain's Prince William calls for optimism on environment at EarthShot Prize event
Britain's Prince William expressed optimism on Wednesday about tackling global environmental challenges at a star-studded event in Rio de Janeiro for the fifth edition of his EarthShot Prize.
Afghanistan and Pakistan return to Istanbul for more peace talks
Afghanistan and Pakistan will resume peace talks in Istanbul on Thursday, both nations said, after a previous round ended without agreeing a lasting truce.
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