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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US President Donald Trump on Sunday called on Ukrainian President Volodymyr Zelenskiy to stop targeting Russian diesel infrastructure, saying the attacks were causing a shortage of the fuel that is "hurting the world".
Rescuers search for 130 people after Indonesia passenger ship sinks; six dead
Indonesian rescuers were searching on Sunday for 130 people from a passenger ship that sank in the Java Sea after 113 others were evacuated, the country's search and rescue agency said, adding that six people had died.
Russia hits passenger train on Ukraine's border with Poland, just misses 'diplomatic train'
A Russian drone hit a passenger train on Ukraine's border with NATO member Poland on Sunday, shortly after former British Prime Minister Boris Johnson and other European diplomats had used the same line.
Russian drone attack injures five in Ukraine's Odesa, officials say
At least five people were wounded in a Russian attack on the Ukrainian city of Odesa on Sunday morning, officials said, a day after strikes on the city killed two people.
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