They were among 159 men and women who had come to the New Club bar in My Tho Town to attend a birthday party.

The police also seized several different drugs and tools for consuming them at the bar.

This is the second time that New Club has been found with customers using drugs. The first time was in 2018, when 50 users were detected.

Last year, a 19-year-old woman was killed at the bar following a quarrel.

When Prime Minister Nguyen Xuan Phuc allowed karaoke parlors and discos across the nation to reopen on June 9 after more than three months of closure amid the Covid-19 outbreak, he had called for strict action against violations, especially drug trading and abuse, at such facilities.

Vietnamese authorities deal with around 20,000 drug cases every year in which around 30,000 people are detained, according to police data. The country has some 250,000 registered addicts, though the actual figures of users are thought to be much higher.