All of the people held in the casino resort in the Chinese special administrative region tested negative for the coronavirus and had been released, health authorities said, however they must take daily coronavirus tests.

The former Portuguese colony has discovered about a dozen coronavirus cases in the past week after having no cases for more than three months.

Macau closely follows China's "dynamic zero" coronavirus policy which seeks to immediately curb any outbreaks. Macau has an open border with the mainland and many cross back and forth from homes and jobs in the neighbouring city of Zhuhai.

A round of mass PCR tests of Macau's 700,000 people on Wednesday found all samples negative for the virus. Another round of mass tests will be conducted on Friday and Saturday, the government said.

(Reporting by Farah Master; Editing by Robert Birsel)