ST. JOSEPH COUNTY, Ind. -- The St. Joseph County Police Department executed search warrants and made entry at four massage business locations and one residence in St. Joseph County on Monday.

Police investigators suspect human trafficking and prostitution have been occurring at the four massage businesses.

Investigators continue to interview potential witnesses, suspected victims and possible criminal suspects.

No arrests have been made yet.

The Indiana State Police, the Battle Ground Police Department, the Indiana Department of Revenue, and the Indianapolis Metropolitan Police Department are also aiding in the investigation.