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MANILA (2nd UPDATE)—Authorities rescued 35 Chinese women inside a hotel allegedly used as a prostitution den in Makati City late Monday night.

Police also arrested 21 foreign clients, some believed to be Chinese working in the Philippine offshore gaming operator (POGO) sector.

Makati City police chief Rogelio Simon said they were tipped off that the hotel, which opened in 2018, was a front for prostitution.

Transactions reportedly took place over social media, where rates could go up to P20,000.

"They don't accept Filipino customers," Simon said.

Some 10 Filipino hotel employees, who were also apprehended during the raid, said they were not aware the establishment was involved in the sex trade.

"We only clean the rooms," an employee told ABS-CBN News.

This is the fourth raid on a sex ring involving Chinese in Metro Manila in 2 months. Those arrested will face complaints for violating Republic Act 10364, also known as the Expanded Anti-Trafficking in Persons Act of 2012.

Operatives of the National Bureau of Investigation (NBI) rescued some 91 Chinese women and 4 Filipino women inside an upscale KTV bar in Makati City.

Police also rescued more than 50 Chinese women inside a 3-storey condominium building in Baclaran, Parañaque City on Sept. 16.

On Sept. 4, some 6 Vietnamese women were rescued inside a condominium unit in Barangay San Antonio, Makati City.

—Report from Anjo Bagaoisan and Jekki Pascual, ABS-CBN News