The FBI is warning police across the country that an anti-government group's effort to remove governors from office could provoke violence.
The group, called the Guardians of the free Republics, wants to "restore America" by peacefully dismantling parts of the government, according to its website. It sent letters to governors, demanding they leave office or be removed.
Investigators do not see threats of violence in the group's message, but fear the broad call for removal of top state officials could lead others to act out violently. At least two states reinforced security in response.
Minnesota governor Tim Pawlenty, a Republican, said he received one of the letters but was not overly alarmed.
"We get all kinds of, shall we say, 'interesting' mail, so it's not out of the norm," Pawlenty said on Friday. "It got more attention because it went to so many governors."
As of Wednesday, more than 30 governors had received letters saying if they do not leave office within three days they will be removed, according to an internal intelligence note by the FBI and the Department of Homeland Security. The note was obtained by AP.