Vietnam on Tuesday locked down its third-largest city for two weeks after 15 cases of COVID-19 were found in a hospital, the government said. Public transport into and out of the central city of Da Nang was cancelled. Over the weekend, thousands of mostly Vietnamese tourists had to end their summer holidays in the popular beach destination. The lockdown has dealt a hard blow to the city’ tourism industry, which was just being revived after earlier coronavirus cases mostly subsided at the end of April.

Hotel guests prematurely ended their stays and cancelled upcoming trips upon the news of the first case, one hotelier said on the condition of anonymity because he was not authorized to speak to media.

“Our hotel is now empty,” the hotelier said. “But we had to help our guests to leave the city when they still had the opportunity yesterday.”

Da Nang beaches, which host some 50,000 people daily are now closed. Only security personnel were seen on the beach Tuesday as they patrolled to ensure no one was gathering.

Authorities estimated several thousand people would be stranded by the transportation shutdown and asked hotels to shelter them.

“We did not want to rush to the airport to leave the city because of the risk being in a crowded place. So we are now stuck here,” said Lien Nguyen, who is travelling with her family of four for their summer vacation.

“But it is not a bad place to get stranded for two weeks,” she said.

On Sunday, the government ordered unessential business to close and required people to practice social distancing in the city of 1.1 million population.

All 15 cases in the new outbreak are patients and health workers at Da Nang hospital.

With the new infections, Vietnam has reported 431 cases of COVID-19 without a death.