Fiery clashes erupted across the city, with security chief John Lee cautioning "unthinkable" consequences if the violence continued.
Authorities have shut down schools, rail links and several businesses in the Asian financial hub as a safety precaution.
On Tuesday night, hundreds of black-clad protesters tried to block riot police from entering the Chinese University of Hong Kong (CUHK) near Tai Po by hurling bricks and petrol bombs.
Israel strikes Gaza as Palestinians pin hopes on Trump's Gaza plan
Israeli planes and tanks pounded areas across the Gaza Strip overnight and on Sunday, destroying several residential buildings, witnesses said, as Palestinians desperately awaited implementation of a US plan to end the war.
Indonesia school collapse death toll rises to 36
The number of students confirmed dead after the collapse of a boarding school building in Indonesia rose to 36, from 16 a day earlier, the country's disaster mitigation agency said on Sunday.
5 killed, energy infrastructure damaged in Russian air attack on Ukraine
Russia rained missiles and drones on Ukraine in a mass overnight attack, officials said on Sunday, killing at least five people and damaging civilian infrastructure including energy facilities across numerous regions.
Heavy rains kill at least 47 in Nepal in two days
Heavy rains triggered landslides and flash floods blocking roads, washing away bridges and killing at least 47 people since Friday in Nepal, officials said on Sunday.
Russian strike hits passenger train in Ukraine, injuring dozens
A Russian drone strike hit a passenger train at a station in Ukraine's northern Sumy region, injuring dozens of people, officials said on Saturday.
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