VIRGINIA, MN (KDAL) - The St. Louis County Sheriff's Office is investigating a suspicious letter that was sent to the Court Administrators Office in Virginia. The letter contained an unknown substance which was removed and forwarded to the Minnesota State Health Department for testing. No health issues or injuries were reported. As a precaution, the Court Administration Building was evacuated and will remain closed until the investigation is complete. UPDATE: The substance was tested and found to pose no health or safety risk. The Court Administrators Office will reopen on Monday. The investigation into the incident continues.