Shanghai Disney Resort (DIS  ) abruptly shutdown on Monday to comply with China's zero-COVID policy, directing all visitors to stay in the park at the time of the announcement to until they test negative.

The resort announced at 11:39 a.m. local time it would immediately close the main theme park and surrounding areas to comply with the nation's strict prevention measures.

"All guests have exited the park" following "expedited COVID testing," Disney said in a statement Tuesday. The company did not say when the park will reopen.

Reuters reported that the Shanghai government had barred anyone who had barred people from entering or exiting after they became aware a woman had visited the park in recent days had tested positive for COVID.

City officials said on the government's WeChat account that anyone who had visited the park since Oct. 27 will need to test for COVID-19 three times in three days. Reuters reported that the park continued to operate for visitors already inside during the closure.

As many countries begin to ease coronavirus restrictions as effective vaccines and treatments become more readily available, China has continued its Zero COVID strategy, which aims to isolate every case to halt outbreaks before they get out of control. Shanghai has reported 10 locally transmitted cases for Oct. 30, Reuters reports, with all those infected not experiencing symptoms.

Disney is "required to follow the standard procedures set forth by Shanghai, which was the same process for a previous closure like this one that occurred one year ago," a Disney spokesperson said in a statement.

Shanghai Disney closed for two days last November last year with more than 30,000 visitors still inside, with authorities ordering all of them to be tested in a contact tracing exercise, Reuters reports.

Universal's (CMCSA  ) Resort in Beijing, China reopened on Monday after a similar five-day closure.