Some 38 foreign men and women were detained by Malaysian police after authorities raided an unlicensed pub in Selangor on Friday night.

At 10pm on November 30, officers from Selangor Immigration Department undertook a special operation known as Ops Gegar, checking the details of 51 people and detaining 38 foreigners for further inquiries, the Sin Chew Daily (Malaysia) reported.

The foreigners, who between 18 and 35 years old, were arrested for working as waitresses, bar assistants and customer service officers at the premises.

Police said there were 18 Thai women, five Thai men, 10 Vietnamese women, a Vietnamese man, and four Bangladeshi men.

Some had tried to escape via the back door of the premises, after realizing the entertainment pub was being raided, but failed.

The case is now being investigated under Section 6 (1) (c) of the Immigration Act 1959/63 and Regulation 39 (b) of the Immigration Regulations 1963.