Experts on Beijing's public-security operations have urged authorities to do more about the influx of foreign sex workers, after the arrest of four foreign women at a downtown club.

Police raided Qixingdao bar in Chaoyang district on July 18 and arrested 15 suspected prostitutes, including the four foreigners, according to a statement by the Public Security Management Corps under the Beijing Public Security Bureau on Tuesday.

Located in the basement of Huasheng International Mansion, an office building close to many embassies, the bar was closed on Tuesday. An employee of a warehouse next door who did not want to be identified said it will stay shut for two months.