LINCOLN CITY, Ore. (AP) -- A sheriff in Oregon says he has contacted the FBI and is increasingly concerned about a letter circulating in his rural, coastal community asking people to write down the license plate numbers of possible undocumented immigrants.

The Lincoln County Sheriff's Office issued a news release on Thursday condemning the letters that have appeared across the county, describing them as divisive. Sheriff Curtis Landers told KPTV that he contacted federal authorities after receiving such a letter himself.