On the eve of the primaries, police searched the office of independent pollster Robert Chung, whose Hong Kong Public Opinion Research Institute helps organise the election, raising concerns among activists of interference in the poll.
Prime Minister Scott Morrison announced a range of visas that will be extended from two to five years and offered pathways to permanent residency visas. It is not clear how many Hong Kongers are expected to get the extensions.
Twitter said it had suspended all information requests from Hong Kong authorities immediately after the law went into effect last week.
Last week, China enacted a security law outlawing four national security crimes: subversion, secession, terrorism and colluding with foreign forces.
Hong Kong's anti-Beijing activists are considering an unofficial parliament-in-exile to reflect the views of Hongkongers, many of whom have removed all references of their opposition to the ruling Communist Party from their social media.
The Chinese embassy in London said "all Chinese compatriots residing in Hong Kong are Chinese nationals" responding to UK's remarks on offering citizenship to Hong Kongers amid the new security law in the country.
The new office will be dealing with applications from Hong Kong citizens seeking to move in Taiwan amid the new security law and from those applying for "political reasons".
Chinese and Hong Kong media say the Standing Committee of the National People's Congress voted unanimously to approve a national security law for Hong Kong.
The legislation pushes Beijing further along a collision course with the United States, Britain and other Western governments, which have said it erodes the high degree of autonomy the global financial hub was granted at its July 1, 1997 handover.
China says the national security should worry only those who don't abide by the legislation but Hong Kong democracy activist Joshua Wong says he will be targeted.
European Commission President Ursula von der Leyen and European Council President Charles Michel had video calls with Chinese Premier Li Keqiang and President Xi Jinping, where they discussed ties, as well as China's security law for Hong Kong.
China released some details of the legislation late Saturday, heightening fears that the central government is tightening its grip on Hong Kong after months of anti-government protests last year.
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