Vietnam imposed more coronavirus restrictions Thursday as an outbreak that started in a popular beach resort destination grew with nine new cases.

Eight of the new infections were detected in the virus hot spot of Da Nang and another was confirmed in the capital Hanoi in a man who had returned from the coastal city, the health ministry said.

The outbreak has spread from Da Nang in central Vietnam to 5 other cities and provinces with 43 cases since the weekend, and Vietnam is intensifying protective measures across the country.

A health worker disinfects arriving Vietnamese COVID-19 patients at the national hospital of tropical diseases in Hanoi, Vietnam on Wednesday, July 29, 2020. The 129 patients who were working in Equatorial Guinea were brought home in a repatriation flight for treatment of the coronavirus. (Bui Cuong QuyetVNA via AP)

A health worker disinfects arriving Vietnamese COVID-19 patients at the national hospital of tropical diseases in Hanoi, Vietnam on Wednesday, July 29, 2020. The 129 patients who were working in Equatorial Guinea were brought home in a repatriation flight for treatment of the coronavirus. (Bui Cuong QuyetVNA via AP)

Dak Lak province starting Thursday morning is reimposing social distancing, closing nonessential services and banning public gathering of more than 20 people.

Da Nang’s neighbors, the coastal provinces of Quang Nam and Quang Ngai, have closed their beaches and limited businesses that can open.

Another popular tourist destination Hoi An old town, near Da Nang, is also reimposing social distancing.

Hanoi city authorities have cancelled public events and will close down bars and clubs from Thursday. It also plans testing of some 21,000 people who returned from Da Nang before the coastal resort was locked down Tuesday.