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.
Saudi civil defence sends all-clear after alerts issued for capital Riyadh
Saudi civil defence sent an all-clear on Saturday after issuing alerts for a second time for potential danger in Riyadh and the city of Al-Kharj east of the capital, amid an uptick in attacks by Houthi rebels on the Gulf country.
US and Denmark reach deal on Greenland
The United States, Denmark and Greenland have entered into an agreement for the US to develop a significant military presence on Greenland, while prohibiting US adversaries from building their own bases on the island, Donald Trump said.
Trump extends push for $100,000 H-1B visas by another year
President Donald Trump has extended an executive order that would impose a fee of $100,000 for H-1B non-immigrant visas by another year, the White House said.
Death toll in Pakistan police compound attack climbs to 31
The death toll in an attack at a police compound in northwest Pakistan has reached 31, AFP reported on Saturday, citing a police official.
Trump bans three media outlets from White House
US President Donald Trump banned news outlets CNN, MS NOW and Politico from the White House on Friday, complaining about their coverage in a social media post.
