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.

Police have identified “suspicious” mail containing a white powder substance sent to election offices in at least a dozen states. The suspicious packages were all mailed over the course of a week. Packages were intercepted before reaching the intended destinations of Arizona,

The package was sent with a return address to the “U.S. Traitor Elimination Army” and a preliminary investigation showed the powder is likely harmless, officials said.