People wearing face masks throng a footbridge in Wan Chai, Hong Kong, in the morning of May 4, 2020 as the Asian financial hub started to restore most public services in a phased manner. (CALVIN NG / CHINA DAILY)

A screen shows the temperature of every person entering Revenue Tower in Wan Chai, Hong Kong, May 4, 2020. (CALVIN NG / CHINA DAILY)

People maintain a distance while queuing to take the lifts at Revenue Tower in Wan Chai, Hong Kong, on May 4, 2020. (CALVIN NG / CHINA DAILY)

People wearing face masks walk on a footbridge in Wan Chai, Hong Kong, on May 4, 2020. (CALVIN NG / CHINA DAILY)