Charges were filed Tuesday against 10 Bay Area residents accused of participating in a large-scale prostitution and human-trafficking ring based in Hayward.

The 10 defendants are facing five felonies each, including pimping and human-trafficking, according to the Alameda County District Attorney's Office.

The defendants, arrested last week in a raid of multiple towns, including Clayton and Newark, are: Nu Trinh, Ping Fen Wu, Mei Chien Wu, Larry Cordeiro, Li Hun Chiu, Wen Yan Gold, Jennifer Michelle Keahilihau, Di Sun, Curt Adam Mieczkowski and Kuanshun Cheng.

The charges are the culmination of a year-long investigation by the Hayward Police Department that uncovered a sophisticated ring of brothels that police say exploited scores of immigrant Asian women.

Investigators estimate dozens of women have been brought into the United States from Taiwan and China, placed in the prostitution circuit in this country and cycled through Bay Area brothels.

Police departments from Clayton, Newark, Danville, Oakland, Berkeley, Sunnyvale and San Jose were involved in serving  arrest warrants in the case Friday.