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.
Pope Francis dies aged 88, Vatican says
Pope Francis, the first Latin American leader of the Roman Catholic Church, has died, the Vatican said in a video statement on Monday.
Half of Ukraine under air raid alerts hours after Russia ceasefire ends
Ukraine issued air raid alerts for Kyiv and the country's eastern half as blasts shook the city of Mykolaiv early on Monday, authorities said, hours after the one-day Easter ceasefire declared by Russian President Vladimir Putin came to an end.
Vance arrives in India, to hold talks with Modi under US tariffs shadow
US Vice President JD Vance began a four-day visit to India on Monday and will hold talks with Prime Minister Narendra Modi, as New Delhi rushes to avoid steep US tariffs with an early trade deal and boost ties with the Trump administration.
Israel's military finds 'professional failures' in killings of Gaza medics
The Israeli military on Sunday said a review into last month's killing of emergency responders in Gaza found there had been "several professional failures" and that a commander would be dismissed over the incident.
Trump threatens to cut another $1 billion in Harvard funding, WSJ reports
US President Donald Trump is threatening to cut another $1 billion in funding for Harvard University, this time targeting health research, the Wall Street Journal reported on Sunday, as the administration's row with elite schools escalated.
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The Rock and Chris Evans: A Christmas Surprise!
The boys tried their 'pick up' lines on Mais Vault and things did not go according to plan...
Latest album, what happened with BTS, raising a baby girl, eye surgery, and more!
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