An investigation underway Monday at the County Courthouse. At about 9 am, the county was notified that there is a white substance on the door and entrance to the Court Clerk’s entrance of the County Courthouse, located at the 421 I Street. County Public Health is on site and has performed field tests and ruled out most common threats, including biological and chemical agents. Staff is taking samples of the material to an out of area lab for further testing. There was no indication of criminal activity or threats on the facility. Staff has also contacted the FBI, who has approved initiation of clean-up of the material. Out of an abundance of caution the public entrance to the Court Clerk’s office was closed. All other functions of the courthouse stayed open.