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.
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The suspect in the mass shooting at Brown University last weekend is dead, a US attorney said, as authorities investigate whether the same person killed a Massachusetts Institute of Technology professor two days after the rampage at Brown.
No evidence alleged Bondi gunmen received military training in Philippines
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At least 12 killed in Nigeria mining site attack
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Russian attack on Ukraine's central Cherkasy injures six, causes blackouts
Russia launched a "massive" drone attack on Ukraine's central Cherkasy region, injuring six people and triggering a blackout in part of Cherkasy city, the local governor said on Thursday.
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