TRACY  (AP) — Police are investigating an apparent hate crime where several landscape rocks were arranged in the form of a swastika on the lawn of an African-American city councilwoman.

Tracy councilwoman Nancy Young found the Nazi-style swastika near her doorstep in the early morning hours of July 2.

The rocks were dug up from around palm trees in her front yard.

Young told the Tracy Press that she heard the doorbell ring several times around 1 a.m. but nobody in the household answered the door.

Police are treating the incident as a hate crime.

Police said in a statement that the city of Tracy has had four hate crimes reported in recent years.