YANKTON, S.D.(WNAX)- Staff turnover and allegations of possible unethical activity has led to an investigation of the Yankton County Equalization Department.

County Commission Chairman Joe Healy said they first heard of the allegations in an executive session.

Healy says the state Division of Criminal Investigation has been brought into the situation.

Healy says the release of the confidential information may slow down the investigation.

Healy says the leak of the information from the Equalization Office is also part of the investigation.