GREENVILLE, Miss.—Police said they were interviewing a “person of interest” Wednesday evening in connection with a fire that heavily damaged an 111-year-old African-American church on which someone spray-painted “Vote Trump.”

Police Chief Delando Wilson, in an interview with The Wall Street Journal, said the person hasn’t been charged with any crime. Chief Wilson declined to describe the person’s race or gender but said he doesn’t believe anyone else was involved in the incident Tuesday evening.

The Federal Bureau of Investigation is looking into whether civil-rights crimes were committed, said Brett Carr, an FBI spokesman in Jackson, Miss.

Donald Trump’s campaign didn’t reply to a request for comment.

Firefighters found heavy flames and smoke coming from the Hopewell Missionary Baptist Church after 9:15 p.m. Tuesday, said Fire Chief Ruben Brown.