 SHANGHAI Reuters - Protesters clashed with police in central China during a demonstration on Saturday by hundreds of people at a factory producing COVID-19 antigen kits, several videos posted to social media showed. Online users said the protest was over wages and the layoff of several workers by the manufacturer, Zybio, in the central municipality of Chongqing. Reuters was unable to obtain any immediate comment from Zybio, but verified, via geolocation, that some of videos were filmed at the... 