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.
No evidence alleged Bondi gunmen received military training in Philippines
There is no evidence indicating that the two suspects involved in the Bondi Beach attack received any form of military training while in the Philippines, the country's National Security Adviser said on Wednesday.
At least 12 killed in Nigeria mining site attack
At least 12 people were killed and three others abducted when gunmen attacked a mining site in Atoso village in Nigeria's restive Plateau state, a local group leader said on Wednesday.
Russian attack on Ukraine's central Cherkasy injures six, causes blackouts
Russia launched a "massive" drone attack on Ukraine's central Cherkasy region, injuring six people and triggering a blackout in part of Cherkasy city, the local governor said on Thursday.
UN, aid groups warn Gaza operations at risk from Israel impediments
The United Nations and aid groups have warned on Wednesday that humanitarian operations in the Palestinian territories, particularly Gaza, were at risk of collapse if Israel does not lift impediments that include a "vague, arbitrary, and highly politicised" registration process.
Israel approves natural gas deal with Egypt, Netanyahu says
Israel has approved a deal that will supply natural gas to Egypt, Israeli Prime Minister Benjamin Netanyahu said on Wednesday, describing it as the country's largest-ever gas deal.
