Health authorities in a southern Chinese city say they have found 16 people with COVID-19 from neighboring Myanmar.
Officials in the city of Ruili, Yunnan Province, say nine people tested positive on Tuesday. The number includes asymptomatic cases.
On Wednesday, authorities told everyone in the city, roughly 200,000 people, to stay home and undergo emergency PCR tests.
The mass examination detected 29 new cases.
The authorities have yet to determine how the cluster occurred.
Some Chinese media outlets say Myanmar citizens with the virus illegally crossed the border, as the violence in the country continues to worsen.
The Chinese authorities have banned people in principle from entering or leaving Ruili.