BEIJING, China (AFP) — Chinese authorities sealed off a city of almost five million people and imposed strict travel restrictions on several others on Tuesday as they worked to quash a number of Covid-19 clusters near Beijing. The country had largely curbed the spread of the coronavirus, which first emerged in Wuhan in late 2019, with small outbreaks swiftly snuffed out using mass testing, local lockdowns and travel restrictions. But Hebei province in northern China […]