The FBI and USPS are investigating a string of incidents in which suspicious packages were received at election offices, including in Kentucky.

The envelope came from a sender that referred to itself in the return address as “The United States Traitor Elimination Army,” a State Board of Elections employee said. The substance was determined to be not hazardous.

FBI and Postal Service are investigating suspicious mail containing white powder sent to election offices in at least 16 states. None has been deemed hazardous so far.

The Virginia Department of Elections says an investigation is underway after they received a package with a suspicious white substance.

Indiana is one of the latest to report getting a powdery package in the mail, joining election-related offices in at least a dozen states.