Suspicious packages were sent to election officials in at least six states on Monday, but there were no reports that any of the packages contained hazardous material.

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.

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.