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.
Technical glitch with air traffic system at Delhi airport resolved
The Indian airports authority said late on Friday that a system used to generate flight plans was "up and running", more than a day after a technical glitch led to delays of hundreds of flights at Delhi airport, one of the world's busiest.
Indonesian mosque blasts injure dozens, teenage suspect identified
Explosions at a mosque in Indonesia's capital Jakarta that injured dozens of people during Friday prayers could have been an attack, officials indicated, with a 17-year-old identified as the suspected perpetrator.
Over 200 flights delayed at Delhi airport after glitch in air traffic system
More than 200 flights were delayed at Delhi airport, one of the world's busiest, after an air traffic control messaging system suffered a technical problem, India's airport authority and a source familiar with the matter said on Friday.
India top court says Air India crash report does not insinuate anything against pilot
India's top court said on Friday that a preliminary report on an Air India crash that killed 260 people in June does not insinuate anything against the captain, but it will hear a plea from the pilot's father on November 10 for an independent probe.
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