A field office for Michael R. Bloomberg’s presidential campaign in Knoxville, Tenn., was vandalized overnight, the latest in a series of vandalism incidents that prompted top campaign officials to blame Senator Bernie Sanders for the attacks.

Campaign volunteers arrived at the office on Friday morning to find profanity spray-painted across the glass front doors. Handmade posters, reading “Authoritarian,” “Classist” and “Oligarch,” were plastered on the windows. Mr. Bloomberg, the former mayor of New York City, is a multibillionaire who has spent hundreds of millions of dollars of own money on his campaign so far.

The posters featured what appeared to be clips of news articles highlighting reports of derogatory statements Mr. Bloomberg made about women, Latinos, African-Americans and transgender people. A Hitler mustache was drawn on Mr. Bloomberg’s face in two photos. If elected, Mr. Bloomberg would be the first Jewish-American president.

Similar types of vandalism were reported last week at field offices in Ann Arbor, Mich., Toledo and Youngstown, Ohio.