Downstate authorities busted one of the largest human trafficking rings ever uncovered in Michigan on Friday, resulting in criminal charges for multiple noncitizens and illegal immigrants.

Between seven and nine Korean and Chinese women were freed from four different massage parlors in St. Clair Shores, Sterling Heights, Highland Park and Detroit in raids involving dozens of officers with the Michigan State Police, Homeland Securities Investigations, Sterling Heights Police, and Clinton Township Police, according to Michigan Attorney General Dana Nessel.

The bust stemmed from a months-long investigation that began in the summer, culminating with three arrests and criminal charges against five.

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“This operation has put an end to a significant human trafficking ring, as large as any we’ve uncovered in the State of Michigan,” Nessel said in a statement. “These charges and this operation make it clear that Michigan will be no harbor for the vile trafficking trade for forced labor, sexual or otherwise.”

Authorities are still working to determine which women were victims and which participated in the trafficking ring, but said at a Detroit press conference the AG’s office is coordinating housing and other resources for them. The women may be eligible for special visas for human trafficking victims, she said.

Police arrested Jingyu Jin, a 45-year-old Chinese national, on six felonies, including conducting a criminal enterprise, accepting earnings from prostitution, and keeping a house of prostitution. Police believe Jin, who resides in Flushing, N.Y., was in charge of the operation, and she was arrested after arriving in Michigan on Friday, The Detroit News reports.

Another Chinese woman, 60-year-old Hauzi Piao, faces five similar felony charges for helping to operate several parlors, while Clinton Township resident Jon Villasurda, a U.S. citizen, faces three felonies for transporting victims.

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Also arrested Friday was 70-year-old Michael Navoy, who was accused of running a human trafficking operation out of his Southgate home. Navoy faces charges of human trafficking for commercial sex, using a computer to commit a crime, keeping a house of prostitution and other crimes, MLive reports.

“Some of these defendants are noncitizens of this country and pose certain flight risks,” Nessel said. “We are requesting that the courts not offer any bonds and secure their passports.”

Two others who were charged with human trafficking felonies but have not yet been arrested: Oumar Lougue, a 53-year-old non-citizen from West Africa, and Ming Li, a 59-year-old illegal immigrant.

Authorities believe Lougue is involved in a business and domestic relationship with Jin and is not currently in the country, Nessel said.

The human trafficking operation involved moving individuals across state lines, and laundering the proceeds from the massage parlors at casinos before leaving Michigan, she said.

St. Clair Shores deputy police chief Paul Plaza told The News the successful investigation shows how the “see something, say something” strategy can have a big impact.

“In our town, at least, it started off with residents or citizens seeing something suspicious, taking that step to report it,” he said. “Our detectives investigated, found out that it was much larger than we suspected.”

Others familiar with the raided businesses were not surprised police shut them down.

“I’ve seen the police go there before,” Darrone Hereford, who works for a barber near Magic Health Spa, told WXYZ. “I heard it was a massage parlor.”

“It’s not a traditional massage,” a local identified only as Aaran told the news site. “They are walking in hoods up, kinda tucked away. You know an unsavory business when you see one.”

The investigation remains ongoing, with authorities looking for customers who frequented the establishments, Nessel said in Detroit.

“If you are frequenting an illicit massage parlor, you are creating more victims,” she said. “We want to make sure people understand this is not a victimless crime. It’s very much a crime that involves people that are victims of some of the most horrendous behavior you could imagine.”