New warning about COVID-19

China's COVID-hit capital Beijing further tightened its dragnet on the virus with zero community transmission the target, punishing workplaces that flout rules or circumvent curbs and imploring residents to police their own movements.

Since late April, the city of 22 million has wrestled with dozens of new cases a day. While these have been mostly in quarantine areas, a handful have been found in the community at large, illustrating the challenge the high transmissibility of the Omicron variant poses even to the world's most stringent pandemic containment policies.

With Shanghai, China's business and commercial hub, and numerous other giant cities also shackled by partial lockdowns or other curbs, the zero-COVID approach remains the government's focus despite the damage it has done to the world's second-biggest economy and global supply chains.