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.
Shooting at Australia's Bondi Beach kills 12
At least 12 people were killed and almost 30 wounded when gunmen opened fire at Sydney's Bondi Beach on Sunday in what Australian police and officials described as a terrorist attack.
Police hold person of interest after Brown University shooting leaves two dead
Providence police have detained a "person of interest" in connection with the Brown University shooting that left two students dead and another nine people wounded at the US Ivy League school.
Hamas says Israel's killing of senior commander threatens ceasefire
Israel's assassination of a senior Hamas commander threatens the viability of the ceasefire in Gaza, the chief negotiator of the group said on Sunday, calling on US President Donald Trump to demand Israel comply with the terms of the truce.
Ukraine's Zelenskyy ditches NATO ambition ahead of peace talks
Ukraine has relinquished its ambition of joining the NATO military alliance in exchange for Western security guarantees as a compromise to end the war with Russia, President Volodymyr Zelenskyy said ahead of talks with US envoys in Berlin.
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