China’s COVID-19 crisis deepened Monday as authorities announced plans to test 18 million people in the city of Guangzhou, northwest of Hong Kong. Officials sealed off the city to most new arrivals and canceled in-person classes for schoolchildren, after officials detected just 27 coronavirus cases on Monday. This comes amid growing popular protests against a sweeping lockdown in Shanghai, where some 26 million people have been confined to their homes for up to three weeks, sometimes without access to food or medicine. Some parents report they spent days separated from young children who tested positive for coronavirus.