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.
US group distributing aid in Gaza reopens sites
A US and Israeli-backed organisation distributing aid in Gaza said on Thursday it was reopening two distribution sites a day after shutting them following a series of deadly shootings close to its operations.
IPL's Bengaluru pledge financial aid for victims of crowd surge
Indian Premier League franchise Royal Challengers Bengaluru have pledged one million Indian rupees (AED42,803) to each family of the 11 fans who died in a crowd surge outside the team's home stadium on Wednesday during celebrations following their maiden IPL title.
US announces pick for NATO's next Supreme Allied Commander
President Donald Trump's administration announced on Thursday its nomination for the next top US general in Europe and said the US military officer would also assume the traditional role of Supreme Allied Commander Europe.
Trump and Xi agree to further talks to settle trade disputes
US President Donald Trump and Chinese leader Xi Jinping agreed to further talks between the countries to hash out differences on tariffs that have roiled the global economy, according to US and Chinese summaries of their phone call on Thursday.
Zambia's former president Edgar Lungu dies aged 68
Former Zambian President Edgar Lungu died on Thursday at the age of 68 at a medical centre in South Africa, his political party the Patriotic Front said.
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