Police swooped on a nightclub in southern Vietnam on Saturday and found dozens of people under the influence of narcotics.

Marijuana, ecstasy and synthetic drugs were among the illegal substances found in the belongings of patrons and waitresses during the swoop on the F1 Club in Thu Dau Mot, the capital city of Binh Duong Province, about 30km east of Ho Chi Minh City.

Twenty-three club-goers tested positive for narcotics on the spot while hundreds of club employees and patrons were escorted to the police station for further inquiries.

Some with symptoms of drug overdose were rushed to the hospital by police officers.

According to police documents, the F1 Club is licensed to offer catering and clubbing services, and to sell cigarettes and alcoholic beverages.

However, as many as 39 of its employees were found to be working without labor contracts at the time of the police raid.

The club owner was unable to show invoices and proof of payment for its imported alcohol and firecrackers.

Last month, a brawl that broke out outside the club between two groups led to the death of one man and the prosecution of two others on charges of murder.

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