The new tactic involves authorities declaring lockdown without warning in a bid to ensure people don't flee before Covid-19 testers arrive in their neighbourhoods.
Home to 7.5 million residents, Hong Kong’s vaccine approval process differs from the one used in mainland China.
The mass arrests were the largest move against Hong Kong’s activist movement since the national security law was imposed by Beijing in the semi-autonomous territory last year.
At least 60 people have been arrested in Hong Kong as anti-Beijing protesters held small demonstrations on China's National Day, flaunting a ban on mass gatherings and protests.
While street protests have largely lost momentum, anti-government and anti-Beijing sentiment persists, with China's offer of mass coronavirus testing for Hong Kong residents prompting calls for a boycott amid public distrust.
Lai owns the group which publishes anti-Beijing paper Apple Daily. His arrest marks the first time the law is being used against Hong Kong's news media.
Washington has imposed sanctions on Hong Kong Chief Executive Carrie Lam and other top officials, prompting a sharp rebuke from Beijing.
The delay has marked a setback for the anti-China camp, which had aimed to win a majority of seats in the legislature. Joshua Wong, one of the disqualified candidates, said their resistance will continue despite crackdowns under the new security law.
Leader Carrie Lam says a third of all infections since the outbreak started have been recorded in the last fortnight. HSBC, Standard Chartered and other banks are racing to close branches or curtail working hours after the spike in cases.
TikTok to exit Hong Kong market within days, while other technology companies, including Facebook, WhatsApp, Telegram, Google, Zoom and Twitter, suspend processing government requests for user data in the region over Beijing's new security laws.
China has imposed a sweeping national security law on Hong Kong, dramatically tightening its grip on the semi-autonomous city in a historic move decried by Western nations as a threat to the financial hub's freedoms.
The agency for semi-autonomous city will collect intelligence and handle crimes against national security, official Xinhua news agency reports.
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