The U.S. Postal Inspector will investigate reports from several Security-Widefield residents who received invitations to join the Ku Klux Klan that were taped to their mail boxes Sunday.

El Paso County Sheriff's Lt. Jeff Kramer confirmed they got calls from alarmed residents on Drew Drive, Cardinal Street and Painted Rock Drive.

"We contacted the postal inspector, who indicated this was a violation of federal law," Kramer said. "The Sheriff's Office will play an assistant role to the investigation."

The fliers were in ziploc bags, containing literature targeting racial groups and listing a phone number that resulted in a voice message claiming white supremacy,