[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/CRIME/01/05/fbi.hiring.binge/art.fbi.jpg caption="The FBI does not believe the letters represent an immediate threat."]
A domestic extremist group has sent letters to more than 30 U.S. governors demanding they resign, the Department of Homeland Security and the FBI said in an intelligence note.
The note, dated Monday, said the letters told the governors to vacate their posts within three days.
The FBI and DHS said there do not appear to be credible or immediate threats of violence attached to the letters.
The group behind the letters has a "Restore America Plan" that calls for the removal of any governor who fails to comply, the intelligence note said.
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