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.
US military marks 11th successive night of attacks on Iran
US Central Command said it completed its 11th consecutive day of strikes on Iran, targeting Iranian military operations centres, maritime capabilities, aircraft hangars, drone storage facilities, and military logistics infrastructure.
Indian opposition disrupts parliament to support student protesters and pressure Modi
Indian opposition lawmakers disrupted parliament on Wednesday in support of student protesters, echoing their calls for the education minister to resign over exam leaks and ratcheting up pressure on Prime Minister Narendra Modi after days of unrest.
Rubio says US still willing to negotiate over Iran crisis
US Secretary of State Marco Rubio said on Wednesday the United States is still willing to negotiate an end to the Iran crisis but Tehran is not serious about talks, as the widening conflict disrupted two of the world's most critical energy chokepoints.
House fire kills 10 in Peru's capital, including five minors
A fire that broke out at a family home in Lima, Peru's capital, left 10 people dead, including five minors, police said on Wednesday.
Ukraine will step up counteroffensive actions, Zelenskyy's new top commander says
The new commander-in-chief of Ukraine's armed forces, Mykhailo Drapatyi, said on Wednesday he had been tasked with stepping up counteroffensive actions and launching new operations inside Russia.
