Two Highland women were arrested in Ontario on Wednesday on suspicion of human trafficking after an investigation by the San Bernardino County Sheriff’s Department.

Stephanie Hill, 40, and Sheila Hill, 44, were arrested after the sheriff’s department said the two trafficked an unidentified 17-year-old girl from Highland. Both suspects are also Highland residents.

“Investigators were able to locate an online ad, where the victim was being advertised for prostitution,” officials said in a media statement. “Additional information placed the victim at an apartment complex located in Highland at the 2600 block of Cypress Avenue.”

The sheriff’s department said deputies executed a search warrant at the apartment complex and conducted surveillance. While deputies were in the area, a female juvenile that matched the description of the girl in the advertisement was seen walking with an unidentified juvenile boy.

“Officers from the San Bernardino City Unified School Police Department assisted in the investigation by responding and detaining the juveniles,” the sheriff’s department said. “While at the apartment, investigators contacted and detained Stephanie and Sheila Hill.”

All four were transported to the sheriff’s department’s Highland station, where the female juvenile was identified as the girl in the online ads, according to authorities.

“The sheriff’s department was able to determine that both suspects had been involved in supporting, encouraging and profiting from the prostitution of the victim,” officials said.

The girl was placed into custody of Riverside County Child and Family Services, and the boy who was detained was determined to not be involved in the investigation, the sheriff’s department said.

“Both suspects were booked into the Central Detention Center for felony charges of pimping, pandering and human trafficking of a minor and are being held in lieu of $150,000 bail,” authorities said.

The two suspects are scheduled to appear at the Rancho Cucamonga Superior Court on Dec. 3.

The sheriff’s department said there are believed to be other unidentified victims related to the case and asked for anyone with information to contact the San Bernardino County Human Trafficking Task Force at 909-387-8400. Those who want to remain anonymous can call We Tip at 1-888-782-4763.