FBI agents raised a number of chiropractic practices in Minneapolis on Tuesday in an apparent fraud investigation.
The Star Tribune reports federal agents raided between six to 10 offices, but few details were released with the search warrants for the properties remaining sealed.
A FBI spokesman told the newspaper the offices were involved in "coordinated operations," and said the Minnesota Department of Commerce's fraud bureau is working with the FBI on the case.
FOX 9 reported more details of the investigation, quoting sources that claim the practices are connected to a long-term insurance fraud probe – potentially including false billing, bogus claims and "staged auto accidents."
The TV station reports one of the offices raided was in northeast Minneapolis, with investigators said to be "very interested in computers, files and perhaps a video recording device."