Authorities say a federal grand jury has indicted two members of an Ohio militia group on charges involving explosive devices.

The federal indictment unsealed Monday in Cincinnati charges 37-year-old Ryan King, of Franklin, and 53-year-old Randy Goodman, of Ripley, with conspiracy to possess a destructive device in violation of the National Firearms Act and possession of an unregistered destructive device.

A Justice Department news release says the men established a United Sheepdogs of Ohio militia group subset they referred to as the "Special Projects Team" and advocated the team construct and use explosives they called "crater makers."

Read more: US News and World Report