Iowa Code § 100.9: Crimes in connection with fires.

If the fire marshal shall be of the opinion that there is evidence sufficient to charge any person with the crime of arson, or with attempt to commit the crime of arson, or of conspiracy to defraud, or criminal conduct in connection with such fire, the fire marshal shall cause such person to be arrested and charged with the offense, or either of them, and shall furnish to the proper county attorney all such evidence, together with the names of witnesses and all of the information obtained, including a copy of all matter and testimony taken in the case.