Police and federal agents have raided four massage businesses in Grand Junction but made no arrests.
The Grand Junction Daily Sentinel reports the raids occurred Tuesday.
In a news release, officials say they suspect the businesses might be involved in prostitution and human trafficking.
The release says some women might be moved from city to city against their will.
A spokesman for the U.S. attorney's office says search warrants were executed but he declined to discuss what was seized. The search warrants have been sealed.
Federal agencies involved in the raids include the Department of Homeland Security and the Internal Revenue Service.
In 2008, federal agents shut down a Grand Junction massage business, and the owner pleaded guilty to pimping and tax evasion. She was sentenced to probation.