A total of 31 Vietnamese women were arrested on Saturday for working illegally in Kuala Lumpur, Malaysia. On October 6, local police acting on a tip-off raided a high-end entertainment establishment in the Cheras district, VN Express reported.

In addition to the 31 Vietnamese women, four women from Malaysia and four Bangladeshi men were also caught in Operation Gegar, the Malaymail reported.

The Vietnamese women – aged between 20 and 40 – reportedly entered Malaysia on social visit passes. According to police, the women were earning up to RM500 (US$120) daily in tips working as guest relation officers.

Immigration officials told Malaymail those arrested were unable to produce legitimate documentation. Their passports also suggested they had overstayed their visas.

They were being detained under the “Anti-Trafficking in Persons and Anti-Smuggling of Migrant Act.”

The Malaysian government has been cracking down on illegal immigration for months. In August, Immigration officials pledged to remove all illegal immigrants from the country.

A voluntary surrender scheme was introduced where all illegal immigrants were able to return to their countries with no repercussions by August 31.