HOLLAND TOWNSHIP, Mich. (WOOD) — A Holland-area massage parlor is under investigation for reports of sexual assault and prostitution, deputies say.

In July, after going to Rong Massage on Douglas Avenue near 144th Avenue in Holland Township, a customer complained to law enforcement.

“She was in there and reported afterwards that she had been touched inappropriately during that massage,” said Capt. Jake Sparks with the Ottawa County Sheriff’s Office.

After launching an investigation, the Ottawa County Sheriff’s Office said about a half-dozen people came forward, both men and women, claiming they also experienced unwanted touching and sexual assault at the massage parlor — but the allegations didn’t stop there.

“Tips and suspicious incidents even where somebody reported that they suspected prostitution was taking part there,” Sparks said.

On Wednesday, deputies and the FBI West Michigan Based Child Exploitation Task Force searched the business for evidence.

“Just to make sure that there’s no trafficking concerns going on,” Sparks said. “At this point, we don’t believe that there is.”

So far, no arrests have been made, but Sparks said he expects there will be charges.

“Several people have contacted the sheriff’s office already with additional information,” he said. “So once we take that information, compile it all, we’ll turn it over to the prosecuting attorney’s office.”

On Thursday, News 8 stopped by Rong Massage, which was still open. An employee declined to go on camera but said she doesn’t understand what is happening with regard to the investigation.

A worker at a nearby business told News 8 that Rong Massage is never very busy and he’s shocked by the allegations.

As the investigation continues, Sparks said deputies want to hear from you if you know more.

“Sometimes people don’t want to come forward because of embarrassment or because of being victimized or whatever,” Sparks said. “So just by getting the information out, it may help us identify people who have more information or who have been victimized themselves.”

Anyone with information is asked to call the Ottawa County Sheriff’s Office at 616.738.4000 or Silent Observer at 877.887.4536.