China’s capital Beijing closed more businesses and residential compounds on Friday, with authorities ramping up contact tracing to contain a COVID-19 outbreak, while resentment at the month-long lockdown in Shanghai grew. In the finance hub, fenced-in people have been protesting against the lockdown and difficulties in obtaining provisions by banging on pots and pans in the evenings, residents said.

A video on social media, showed a woman warning people via a loud-hailer not to do so, saying such gestures were being encouraged by “outsiders.” The Shanghai government did not immediately respond to a request for comment. In Beijing, authorities were in a race against time to detect COVID cases and isolate those who have been around them. A sign placed outside a residential complex read, “Entry only. No exit.” At a press conference on Friday, health officials did not respond to whether Beijing will go under lockdown or what circumstances might prompt such measures.