People living in the same building as confirmed virus cases now also risk being transported to government-run quarantine facilities, according to local residents and widely circulated social media posts. Previously, only people living in the same apartment or the same floor as positive cases would likely be considered close contacts and put in official quarantine.

The ramping up of curbs comes even as the city reported its fewest cases in more than six weeks, with 3,947 new infections on Sunday, down slightly from 3,975 on Saturday.

Social media posts questioning the legality of forcibly removing people from their homes and taking them to quarantine facilities, or seizing their keys to allow health workers to disinfect apartments, also appear to have been removed in some cases.