Chinese officials have weaponised a vast tracking system to block protesters from travelling to the site of the rally in the central province of #Henan. More than 200 bank customers, who planned to join a protest demanding access to their #money after their accounts were frozen, saw their health codes turned from green to red last week. Some were barred from public transport, while others were ordered to quarantine. #finance #health #protest Reoporting by @rachel_cheung1