Another 29 people were arrested as part of the operation carried out with the help of Chinese police, police said in a statement.
"The victims were forced to take drugs or medication to overcome their resistence to prostituting themselves in their homes, or hotels or nightclubs," the statement said.
Police said further details would be given at a news conference in Madrid tomorrow.
Just over 191,000 Chinese nationals live in Spain, making the Chinese immigrant population the fourth largest foreign community in the country, according to national statistics institute INE.
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