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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Israeli Prime Minister Benjamin Netanyahu said on Sunday he had ordered troops to move further into Lebanon in the battle against Hezbollah, despite a ceasefire announced more than six weeks ago.
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At least 55 people were reportedly killed in a blast in Myanmar's Kaung Tat village, which a rebel army said was caused by the accidental explosion of material stored for use in mining.
US military says it turned away blockade runner trying to reach Iranian port
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Two hundred hurt in post-game violence as Paris hails second Champions League triumph
More than 200 people were injured and one person died in Paris following Paris Saint-Germain's second consecutive Champions League win, the interior ministry said on Sunday, reviving France's heated debate about street violence.
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