Jones used the n-word, saying “if those — try to put more than that [20,000] in the [Metro] park, they will have to deal with me,” according a complaint filed by a coworker against Jones.
Spokesman Tom Francis said Jones received a notice of disciplinary action Friday and acknowledged the discipline by signing it.
The 10 days will be subtracted from Jones’ personal leave time, Francis said.
He said Fire Chief Martin Senterfitt determined the discipline.
Senterfitt says the complaint surprised him because Jones has few complaints and a strong reputation.
The chief called use of the word inappropriate in the workplace.
The punishment comes as the city and firefighters union fight three pending racial discrimination lawsuits.