Madera police are investigating a prostitution ring that may be involved with human trafficking victims from El Salvador.
Police Sgt. Matt Wiles said detectives served a warrant Thursday morning in the 1000 block of Tulare Street after watching a house on the block.
Wiles said the operation moves women from one home to another on a weekly basis throughout California.
Detectives also served warrants at an undisclosed address in Fresno.
Additional information was not immediately available.