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.
Thousands stranded at Japan's Narita airport after record rain kills four
Record rainfall has left thousands of travellers stranded at Tokyo's Narita airport on Friday morning as flooding in the surrounding area disrupted transport, knocked out power to homes and claimed at least four lives.
Air India A320 briefly lost key flight controls during 300-foot drop, Airbus analysis shows
An Air India Airbus that dropped about 300 feet this month, injuring 24 people on board, briefly lost key flight controls after registering losses in all three hydraulic systems, according to a preliminary Airbus analysis reviewed by Reuters.
Three killed, 17 injured in Cairo mall helium cylinder explosion
Three people have been killed and 17 others injured on Thursday following a fire that broke out from a helium cylinder explosion at Arabella Plaza Mall in Egypt's New Cairo.
US to apply economic measures 'never seen' on Iran, says Treasury Secretary
US Treasury Secretary Scott Bessent said on Thursday that the United States is going to apply economic measures that have "never been seen" on Iran.
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