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.
Britain pushes allies to boost Ukraine support as Zelenskyy lands in London
Britain on Friday urged fellow allies of Ukraine to reach a deal to use frozen Russian assets to strengthen its hand for any future peace talks, as President Volodymyr Zelenskyy arrived in London for talks with those allies.
Erdogan says US, others must press Israel to abide by Gaza ceasefire
Turkish President Tayyip Erdogan said the United States and others must do more to push Israel to stop violating the Gaza ceasefire agreement, including the possible use of sanctions or halting arms sales.
EU vows financial backing for Kyiv
European Union leaders agreed on Thursday to meet Ukraine's "pressing financial needs" for the next two years but stopped short of endorsing a plan to use frozen Russian assets to fund a giant loan to Kyiv due to concerns raised by Belgium.
Tourists gawk and recoil at Trump's destruction of the White House East Wing
With many Washington tourist spots closed due to the US government shutdown, some visitors instead are checking out an unexpected and divisive new attraction in the nation's capital: President Donald Trump's surprise demolition of the White House's East Wing.
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