Authorities in Shanghai have again tightened anti-virus restrictions, just as the city was emerging from a month-long lockdown due to a COVID-19 outbreak. Notices issued in several districts said residents were ordered to stay home and nonessential deliveries were to be suspended as part of a "quiet period" lasting at least until Wednesday. It wasn't clear what prompted the renewed tightening, with numbers of new cases in the city continuing to fall. Shanghai on Monday reported less than 4,000 cases over the previous 24 hours, almost all of them asymptomatic, along with 11 deaths.