China's top Covid official has signalled a possible relaxing of the country's strict zero-tolerance approach to the virus, after nationwide protests calling for an end to lockdowns and greater political freedom.

Anger over China's zero-Covid policy, which involves mass lockdowns, constant testing and quarantines even for people who are not infected, has sparked protests in major cities including Beijing, Shanghai and Guangzhou.

But while authorities have called for a "crackdown" in the wake of the demonstrations, they have also begun hinting that a relaxation of the hardline virus strategy could be in the works.

Speaking at the National Health Commission yesterday, Vice Premier Sun Chunlan said the Omicron variant was weakening and vaccination rates were improving, according to the state-run Xinhua news agency.

Ms Sun, a central figure behind Beijing's pandemic response, said this "new situation" required "new tasks".

She made no mention of the zero-Covid policy in her latest remarks, suggesting an approach that has disrupted the economy and daily life might soon be relaxed.

The comments came as the southern manufacturing-hub Guangzhou - the site of dramatic Tuesday night clashes between police and protesters - said it had partially lifted a weeks-long lockdown, despite seeing record virus cases.

Officials yesterday eased restrictions to varying degrees in all of the city's 11 districts, including Haizhu, where recent protests took place.

Chinese residents in Japan and supporters stage a rally to protest against China's zero-Covid policy

With the exception of a number of designated "high-risk" neighbourhoods, the Guangzhou health commission said, "the rest will be managed as low-risk areas".

The central city of Chongqing also said yesterday close contacts of Covid cases who met certain conditions would be allowed to quarantine at home - a departure from rules that required them to be sent to central isolation facilities.

Ms Sun's remarks, as well as relaxations of rules by local authorities, "could signal that China is beginning to consider the end of its stringent zero-Covid policy," analysts said.

"We believe that Chinese authorities are shifting to a 'living with Covid' stance, as reflected in new rules that allow people to do 'home isolation' instead of being ferried away to quarantine facilities," ANZ Research analysts said in a note.

China police deploy high-tech tools to crush protests

Chinese police have deployed sophisticated surveillance tools in a push to stamp out a nationwide wave of unrest, using facial recognition software and location data to track down and detain protesters.

As Beijing announced a crackdown against the protests, its vast security apparatus swung into gear, using state-of-the-art surveillance to track down activists, according to a human rights lawyer offering free legal advice to protesters.

Facial recognition software is reportedly being used by Chinese police to track down activists

"In Beijing, Shanghai and Guangzhou, police have seemingly used very high-tech methods," said Wang Shengsheng, a lawyer based in the city of Zhengzhou.

"In other cities, it seems like they have relied on surveillance footage and facial recognition," she told AFP.

Beijing police may have used phone location data either captured from on-site scanners or Covid health codes scanned by people taking taxis to areas where protests took place, she said.

"Many callers from Beijing were confused as to why they were contacted by police when they genuinely just walked past the protest site and didn't take part," she added.

"We have no idea how exactly they did this."

In Shanghai, police have confiscated the phones of all those she was in touch with and who were summoned for questioning, "perhaps to extract all their data", she added.

'Sign of weakness'

As China reaches the third anniversary of the pandemic first being detected in the central city of Wuhan, its hardline approach to the virus has stoked unrest not seen since the 1989 pro-democracy protests.

A deadly fire last week in Urumqi, the capital of the northwestern region of Xinjiang, was the catalyst for the outrage, with people blaming Covid curbs for trapping victims inside the burning building.

But demonstrators have also demanded wider political reforms, with some even calling for President Xi Jinping to stand down.

China's strict control of information and continued travel curbs have made verifying protester numbers across the vast country very challenging.

Protesters attended a rally earlier this week in defiance of China's harsh Covid-19 restrictions in Beijing

However, the widespread rallies seen over the weekend are exceptionally rare in China.

The 1989 pro-democracy protests ended in bloodshed when the military moved in, most famously in Beijing's Tiananmen Square and surrounding areas.

The death yesterday of former Chinese leader Jiang Zemin - who came to power just after Tiananmen - saw the ruling Communist Party emphasise his role in that crackdown.

US Secretary of State Antony Blinken, asked about the protests in an interview with NBC News, said that people in every country should be able to "make known their frustration" through peaceful protests.

"In any country where we see that happening and then we see the government take massive repressive action to stop it, that's not a sign of strength, that's a sign of weakness," he said.