BEIJING – The Chinese authorities continue to clamp down on anti-lockdown protest activities across the country, stepping up police patrols in some major cities and interrogating protesters at gatherings held last weekend.

In Shanghai, where a massive crowd gathered on Wulumuqi Road on Saturday and Sunday, police have set up blue barriers preventing people from congregating.

Social media videos show police officers in a subway train checking commuters phones for banned apps such as Telegram and Signal, both secure messaging platforms.

Beijing has also had a heavier police presence than usual. By the Liangma River, where a protest was held on Sunday, there were more police cars and patrolling officers. An embassy district south of the city and home to a popular park also saw dozens of police vehicles most with their red-and-blue lights flashing and officers on the lookout for anything suspicious.

The police have also been questioning protesters whether over the phone or appearing at their homes sending a chilling effect through the community, many who cannot ascertain for sure how they have been tracked down.

Some have deleted apps on their phones, including those allowing access to virtual private networks to access sites banned in China such as Telegram, Instagram and even WhatsApp.

I just need a few days break before I can think of anything more, one protester told The Straits Times via a social media app. She declined to be identified for fear of further reprisal.

The recent graduate said she had received a phone call from her local police station asking about her involvement in Sundays Beijing protest. She is now reconsidering taking part in future activities.

The Cyberspace Administration of China (CAC) has also issued guidelines on cleanup efforts, targeting protest organisers and censorship circumvention tools, and has told media outlets to watch out for red letter days.

These include Dec 9, which isInternational Anti-Corruption Day, and Dec 10, which marks International Human Rights Day, said the CAC circular that was first reported by China Digital Times, a website that reports on Chinas Internet.

Pay careful attention to these and other sensitive dates, maintain strict controls, and strengthen preliminary content audits. Promptly identify and report content aimed at stirring up public sentiment or any such similarly targeted content, it added.

Telegram groups where people have been sharing details about protests and vigils, along with promotional material, have also been targeted, with some suspended for having shared pornographic content. More On This Topic China police deploy high-tech tools to crush protests Chinas Covid-19 protesters find themselves up against censorship, surveillance On video-sharing sites, bullet comments chatter that runs across videos in real time have been suspended.

Social media platforms and news outlets have also banned commenting on any article relating to the death of former president Jiang Zemin, for fear that any expression of condolence could be a veiled criticism of the government.

Have a good journey, thank you for allowing everyone to watch Titanic all those years ago, read a popular post on Weibo, a reference to a more open era when foreign films were regularly screened in Chinese cinemas.

Commenting and sharing were quickly disabled on the post, which was later made unsearchable. More On This Topic Chinas Generation Z is not lying flat any more China protests the nudge needed for better Covid measures