China's Shenzhen to adopt tiered COVID measures; Chengdu extends lockdown

China's southern tech hub of Shenzhen said it will adopt tiered anti-virus restriction measures starting on Monday, while the southwestern metropolis of Chengdu announced an extension of lockdown curbs, as the country grapples with fresh outbreaks. Shenzhen, which went into a weekend lockdown on Saturday, announced a new round of COVID-19 testing, and vowed to 'marshal all available resources, mobilise all forces, and take all possible measures' to stamp out the pandemic.