MEDINA, Ohio (AP) — An Ohio small business owner says a small sign promoting empathy and kindness he put in his window has prompted an anonymous letter criticizing him for his “political views.”

Thomas Flood owns the Medina Family Practice and Wellness Center in northeastern Ohio, where he treats minor illnesses and provides student physicals. He told the Plain Dealer that he put up a sign reading “Hate has no home here,” when he opened his business in July.

Flood says he received an anonymous letter about the sign earlier this month, supposedly from a coach who said he’s refusing to send athletes to the business over the “political sign.”

Police Chief David Arbogast says police are investigating. Medina Diversity Project leader Pamela Miller calls the letter “a black eye for this community.”