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.
Merz unveils fresh military aid in Kyiv, says Germany won't be intimidated
Germany will not be intimidated into dropping its support for Ukraine, Chancellor Friedrich Merz said on Sunday as he announced a further €1 billion ($1.1 billion) in military aid during a visit to Kyiv marked by Russian drone attacks.
Protests demanding Indian election chief resigns escalate
Thousands of youth protesters and opposition supporters rallied in Delhi and Mumbai on Sunday to demand the resignation of India's election commission chief over changes to voter rolls, as police detained some demonstrators for a third day.
US Coast Guard finds debris from missing medical aircraft off Nantucket
The US Coast Guard said late on Saturday it found debris from a medical transport aircraft off the shore of Massachusetts' Nantucket island and was searching for six people who were on board.
Trump names intelligence chief as AI czar
US President Donald Trump has appointed Director of National Intelligence Jay Clayton as the administration's AI czar, the Wall Street Journal reported on Saturday, citing an interview with Clayton.
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