The suspicious packages were all mailed over the course of a week. Packages were intercepted before reaching the intended destinations of Arizona, Georgia, Connecticut, and Maryland, while other suspicious mail reached offices in New York, Tennessee, Wyoming, Kentucky, Oklahoma, Iowa, Nebraska, Missouri, Kansas, Indiana, Massachusetts, and Colorado, according to ABC News.

None of the packages thus far have been deemed dangerous. In one case, it was flour. Still, discoveries of the packages resulted in evacuations at several locations.

“The FBI and U.S. Postal Inspection Service are investigating a series of suspicious mailings sent to election officials in several states,” the FBI said in a statement, WSBTV reported. “Some of the letters contained an unknown substance and we are working closely with our law enforcement partners to respond to each incident and safely collect the letters.”

“We are also working with our partners to determine how many letters were sent, the individual or individuals responsible for the letters, and the motive behind the letters,” the agency added.

One package sent to an office in Colorado reportedly had a return address of the “U.S. Traitor Elimination Army.”

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On Monday, offices in Kansas and Wyoming were evacuated as a precaution after receiving suspicious packages.

Last November, suspicious envelopes were sent to election offices in Washington, Texas, Oregon, Nevada, California, and Georgia, with four testing positive for fentanyl.