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.
Canada plans to recognise Palestinian state, raising allies' pressure on Israel
Canada plans to recognise the State of Palestine at a meeting of the United Nations in September, Prime Minister Mark Carney announced on Wednesday, ratcheting up pressure on Israel as starvation spreads in Gaza.
London flights resume after airports disrupted by radar fault
A radar-related technical issue in Britain's air traffic control system disrupted flights for over four hours at major airports in London and elsewhere on Wednesday, though the issue was later resolved and departures were resuming.
UK airports disrupted by air traffic control issue
Britain's air traffic controllers reported a technical issue that disrupted flights at major airports in London and elsewhere in the country on Wednesday, though later said the issue had been resolved.
Tsunami waves reach Hawaii after huge quake rattles Russia's Far East
A powerful magnitude 8.8 earthquake off Russia's Far Eastern Kamchatka Peninsula triggered tsunami waves of up to 5 metres and sparked evacuation orders in Hawaii and across the Pacific on Wednesday.
India launches NASA-ISRO satellite to track climate threats from space
India launched on Wednesday a $1.5 billion, first-of-its-kind radar imaging satellite built in collaboration with NASA, deploying it to help enhance global monitoring of climate change and natural disasters.
The legendary Craig David joins The Kris Fade Show for an unforgettable chat!
One of the most talked about comedians in the world takes over The Kris Fade Show. Watch the full interview here...
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