Federal officials are investigating after a black U.S. postal employee from Missouri received a racist threat.

The Sedalia Democrat reports that the Sedalia postal employee posted a photo of the note on her Facebook page Tuesday night. It includes a racial slur and was written on the back of an envelope.

Jeff Arney, of the Office of the Inspector General, says the incident is being investigated as first-degree harassment under Missouri's criminal code. He says the office is working to determine if the threat was made or left by a postal employee.

Because the investigation is ongoing, Arney couldn't say much else about the status of the case.

Sedalia Police are also assisting the Office of Inspector General in the case. The post office is located at 405 E. 5th in Sedalia.