Authorities have informed that a group calling itself Guardians of the Free Republics is calling for governors across the United States to step down within three days.

Governors across the nation said they had received the group's letters demanding they resign, the New York Times reported on Friday.  

The FBI and the Department of Homeland Security confirmed they had issued a memorandum to state authorities about the situation, the newspaper further said.

The note states "law enforcement should be aware that this could be interpreted as a justification for violence or other criminal actions," CNN has reported.  

An unnamed Homeland Security official told the Times there was no evidence of "an immediate or credible threat."

The official said, "No specific information indicates that violence is intended. These threat assessments are issued regularly out of an abundance of caution."

The Guardians of the Free Republics' Web site offers a plan to "restore America" by "regaining control quietly, efficiently and quickly without provoking controversy, ridicule, violence or civil war." It says the plan was mapped out "after a year of face-to-face negotiations with high-ranking members of the armed forces."

According to the Homeland Security note, the group's plan proposes "establishing bogus courts, calling of 'de jure' grand juries, and issuing so-called 'legal orders' to gain control of the state."

The group's Web site includes a recruiting letter Sam Kennedy, a talk-show personality who is host of "Take No Prisoners" on the Republic Broadcasting Network, a satellite, shortwave, and Internet radio operation in Texas.

It was further revealed by the reports of the Christian Science Monitor that it was told by the network's John Stadtmiller that Kennedy was interviewed by FBI agents for two hours Friday. Stadtmiller said Kennedy "is the focal point of this, these guardians." (With Inputs from Agencies)