LAPLACE — A LaPlace massage parlor was the front for a prostitution ring, authorities said today, as part of an announcement that included the arrest of four people for their roles in the operation.

St. John the Baptist Parish Sheriff’s Office detectives culminated a month-long investigation, dubbed “Operation Happy Feet,” Thursday following a string of tips received from the public.

“Tips received from the public indicated that more than foot massages were being given by massage therapists at the 7 Star Foot Massage, located at 3025 Highway U.S. 51 Suite B in LaPlace,” a release from the sheriff’s office said. “The number of tips received from the public prompted detectives to initiate an investigation.”

During the undercover operation, authorities said, massage therapists negotiated with undercover detectives to perform a sexual favor for additional money above the massage rates published in the lobby of the storefront.

Detectives arrested and booked:

• Feng Qin Yu, 35, of David Drive in Metairie, with soliciting for prostitutes, promoting prostitution, crimes against nature and contributing to the delinquency of a juvenile. Her bond is $51,500.

• Xiao Zhen Liu, 40, of David Drive in Metairie, with soliciting for prostitutes, crimes against nature and contributing to the delinquency of a juvenile. Her bond is $11,500.

• Junzhi Wang, 55, of Cerro Sur, Richmond, Calif., with soliciting for prostitutes, crimes against nature and contributing to the delinquency of a juvenile. Her bond is $11,500.

• Juvenile, 15, of David Drive in Metairie, LA, with inciting prostitution. Released on personal surety.