Action News has learned the raid is connected to the casino the tribe is working to build north of Madera along Highway 99.
Agents with the FBI and Department of Interior carried away several boxes of evidence after serving a search warrant. The warrant is sealed but tribal members who saw it say it relates to the casino.
A former tribal chair says agents interviewed her nine months ago asking about financial dealings with /*Station Casino's*/, which is the tribe's partner in building the casino. She says the FBI already has internal documents.
/*Jacquie Davis Van Huss*/ said, "They did have financial documents and from my time on the tribal council I know they're confidential documents."
The Interior Department approved the /*North Fork*/ casino in September. The tribe still needs approval from /*Governor Jerry Brown*/.
Watch the video for complete coverage from Action News Reporter Corin Hoggard.