The FBI and the U.S. Postal Inspection Service were investigating the origin of suspicious packages that have been sent to or received by elections officials in more than a dozen states.

Colorado's secretary of state says the poster of the letters called themselves the "US Traitor Elimination Army".

The FBI and the U.S. Postal Inspection Service on Friday were investigating the origin of a suspicious package that was sent to the Minnesota Secretary of State’s Office.

Threatening letters containing packages of non-toxic powders arrived at seven state offices Monday and triggered federal investigations.

A suspicious package that led to the evacuation of the Minnesota Secretary of State’s office contained a “nonhazardous” powder, officials say.

Secretary of State Steve Simon and others spoke about election security earlier this month. (Glen Stubbe/The Minnesota Star Tribune)

The Secretary of State's Office in Minnesota was evacuated on Friday after receiving a "suspicious" package, officials say.

Law enforcement agencies have evacuated the Office of the Minnesota Secretary of State after a suspicious package was delivered on Friday.

A suspicious package was sent to the office of the Minnesota Secretary of State on Friday. The office was subsequently evacuated while an investigation began, which uncovered a white substance described as “nonhazardous” inside the package.

A white powder found inside a suspicious mailing to the Minnesota Secretary of State's Office was nonhazardous. The package was addressed to the office with a return address to the “United States Traitor Elimination Army” and the discovery of the white power inside led to an evacuation of the office.