Several residents of Security-Widefield, Colo. received invitations to join the Ku Klux Klan on Sunday, according to the El Paso County Sheriff's Department.
The Daily Gazette reports that residents of three suburbian streets found ziploc bags taped to their mailboxes containing racist literature with a phone number that when dialed leads to a voice message advocating white supremacy. The U.S. Postal Inspector will investigate the mailings, as the invitations appear to violate federal law.
At least one resident contacted the FBI to request that the bags be tested for ricin, according to KMGH Denver.