DETROIT, MI — Two Oakland County moms have been charged with female genital mutilation as the net expands in a federal investigation into the controversial, internationally condemned procedure. The new charges bring to six the number of people charged by federal prosecutors in a historic case that will be the first court test of 20-year-old federal law criminalizing FGM.

Charged in an indictment unsealed Wednesday in federal court were two Oakland County moms, Fatema Dahodwala and Farida Arif, who are accused of subjecting their daughters to genital mutilation as part of a religious custom among members of the Muslim sect Dawoodi Bohra. The four others previously charged are Dr. Jumana Nagarwala, 44, of Northville; Dr. Fakhruddin Attar, 53, and his wife, Farida Attar, 50, of Farmington Hills; and Tahera Shafiq, 48, of Northville.