Racial slurs left scrawled on a public chalkboard spark an investigation.

Port St. Lucie Police say the words “KKK 4 Life” were found on the chalkboard at Pioneer Park Sunday.

The board is designed by the city for public use, so police not the expressions written are generally considered a form of free expression. But the use of a racial slur violates city policies for engaging in activities at public parks.

That means the person who wrote the phrase could face consequences, including a ban from city parks for up to one year.