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.
Japan's record rains strand thousands at Narita airport; kill eight
Record rainfall in Japan stranded thousands of travellers at Tokyo's Narita airport on Friday, bringing floods to the surrounding area that disrupted transport, knocked out power to 20,000 homes and killed eight.
Air India A320 briefly lost key flight controls, Airbus analysis shows
An Air India Airbus dropped about 300 feet this month, injuring 24 people on board, after the aircraft registered a loss of hydraulic pressure that briefly left key flight controls unresponsive, according to a preliminary Airbus analysis reviewed by Reuters.
Philippine president says he has yet to decide who to back as successor
Philippine President Ferdinand Marcos Jr confirmed on Friday that he would endorse a candidate for the 2028 presidential election, but said he had yet to decide who he would back.
Wildfire descends on Croatian tourist town, injures 36
A wildfire in Croatia driven by strong winds descended on the tourist town of Omis overnight, engulfing houses, forcing about 1,000 people to evacuate and injuring dozens, fire brigade and health officials said on Friday.
