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, German scientists win Nobel medicine prize for work on light and brain
American Karl Deisseroth and Germans Peter Hegemann and Georg Nagel won the 2026 Nobel Prize in Physiology or Medicine on Monday for developing optogenetics, a technique that uses light to control individual nerve cells in the brain.
Nigeria military aircraft crashes with 32 aboard
A Nigerian military plane flying from Benin City to Lagos crashed on Monday in southwestern Ondo state, killing 25 passengers and seven crew members.
At least 22 dead after boats collide on Congo river
At least 22 people have died after two boats collided on the Congo River in the Democratic Republic of Congo.
Spanish PM Sanchez calls snap election for November 29
Spanish Prime Minister Pedro Sanchez called an early election for November 29 on Monday, in a bid to strengthen his mandate after a fragmented parliament rejected the government's key housing decrees last week amid widespread protests.
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