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.
Rescuers pull four from flooded cave in Laos
Rescuers pulled four people from a flooded cave in Laos on Saturday, Thai volunteers said, hours after another man was brought out late on Friday.
Zambia steps up Ebola screening as neighbouring Congo sees cases rise
Zambia has investigated and cleared two suspected cases of Ebola as it steps up screening and surveillance for the deadly viral disease following an outbreak in neighbouring Democratic Republic of Congo.
Pentagon chief says US ready to restart strikes on Iran if no deal
The US is ready to restart attacks on Iran if a deal cannot be reached, Defence Secretary Pete Hegseth said on Saturday, as negotiators from Washington and Tehran worked to bridge major differences blocking an agreement.
Flights briefly halted at Munich Airport over possible drone sighting
Flights were halted for about an hour at Munich Airport in southern Germany on Saturday morning after two pilots reported seeing a drone, airport authorities and police said, confirming initial reports by German media.
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