SIOUX FALLS, S.D. (MITCHELLNOW) Employees of Hibachi Grill & Supreme Buffet on 41st Street in Sioux Falls are facing federal charges for allegedly harboring undocumented immigrants. Court documents accuse the owner and managers of providing housing, transportation, and employment to several people without legal authorization to work in the U.S. The restaurant has been closed since Tuesday while the investigation is ongoing. For more crime stories from MitchellNow.com, click here.