Vietnam announced a daily spike of six domestically-transmitted coronavirus infections on Sunday, alongside 12 imported cases from Japan, Russia, and the Philippines.

Six of the community-based cases, a karaoke parlor’s employees, were registered in northern Vinh Phuc Province, the Ministry of Health said in a report.

They had come into contact with a group of five Chinese experts who visited different places in Vietnam after finishing their quarantine in the country.

Two of the Chinese experts returned to China on April 29. One of them was diagnosed with COVID-19 in their home country on May 1.

The remaing locally-transmitted infections were recorded in Ha Nam, all linked to previous cases in this province.

The health ministry reported four imported cases from Japan, four from Russia, and four from the Philippines.

They had been quarantined since arrival by plane in Vietnam last month.

Twenty-four domestic cases have been recorded in the country since April 29.

Vietnam started enjoying a four-day holiday to observe Reunification Day and International Workers’ Day on Friday.

The country already canceled fireworks displays intended to celebrate the occasions given the health ministry’s warning of a large-scale outbreak.

Tens of thousands of vacationers flocked to popular destinations like Da Lat, Vung Tau, Da Nang, and Nha Trang despite coronavirus risks.

Hanoi, Ho Chi Minh City, and other provinces have shuttered non-essential services such as karaoke parlors, nightclubs, discos, and online game centers to prevent COVID-19 spread.

Vietnam has gone over three phases of COVID-19, with 2,962 infections, 2,549 recoveries, and 35 deaths, according to the Ministry of Health statistics.

A total of 415 cases were logged from January 23 to July 24 last year, 1,136 from July 25 last year to January 27 this year, and 1,411 from January 28 to the present.