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.
Azerbaijan accuses Iran of firing two drones at its territory, injuring two
Azerbaijan accused Iran on Thursday of firing two drones at its territory, injuring two people, and said it had summoned the Iranian ambassador in order to issue a strong protest.
72 killed in Israeli attacks on Lebanon as it warns residents to leave south
Israel has warned residents to immediately leave a swathe of south Lebanon on Wednesday, ordering them to move north of Litani River on the third day of full-blown hostilities with Hezbollah, with the death toll rising to 72 people.
Nepal goes to the polls; voters seek change after youth-led protests
Nearly six months after a wave of unprecedented youth-led protests and the deaths of 77 people forced Nepal's then prime minister to quit, people began voting on Thursday in a general election that will choose a new parliament in the Himalayan nation.
Landslide kills over 200 people at Congo's Rubaya mine
More than 200 people have died on Tuesday in a landslide triggered by heavy rains at the Rubaya coltan mine in eastern Democratic Republic of Congo, the country's mines ministry said on Wednesday.
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