China tightens lockdown measures on north-eastern cities after discovering new coronavirus clusters as officials arrange mass-testing to prevent a second wave

Chinese officials enforced more restrictions on Shulan, a city of 600,000 people. Shulan has been under lockdown since May 9 after reporting an infection cluster. The city of Jilin with 4.5 million residents sealed off one of its districts yesterday. The cities of Jilin and Shulan are located in the same northwestern province Jilin. Over 40,000 local citizens were screened for COVID-19 to avoid a second wave