Members of the Brookwood High School band used the letters of their mascot, the Broncos, to spell a derogatory word.
The game was between Gwinnett County's Brookwood High and DeKalb County's Lakeside High.
"With that in mind, when the sousaphone players took the field, they did not follow band rules and normal practice, and instead, they left the covers on their instruments", Ford said.
One mother, Shawn Myers, said she was appalled and "will not stop" until the culprits are expelled.
On Saturday, school principal Bo Ford sent a letter to the community apologizing, calling the term "racial" (but not "racist") and "completely unacceptable". "The mascot is a horse, it's a bronco, and the "B" and the "R" were nowhere near". But four students chose letters to spell out C-O-O-N and displayed the racial slur on the field for all to see.
"Haven't heard it in years, it's to belittle black people, it's an insult", she said.More news: What Canadians need to know about Tuesday's U.S. midterm elections
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The band was supposed to spell out "Broncos" with their instruments.
He said the activity on the field was "very busy" and that "several personnel challenges" during the senior night activities resulted in the band's director not being on the field during the performance.
"Not only was the appearance of this term during our halftime show hurtful and disrespectful to audience members, but it also was disappointing, as it does not reflect the standards and beliefs of our school and community", the administrator added.
This incident comes weeks after the marching band for Mississippi's Forest Hill High School was barred from participating at competitions and performing on the field at remaining football games after their October 5 halftime show involved musicians pointing fake guns at students dressed as police officers.
Halftime procedures are being reviewed and the school could not comment on any potential punishments for staff members, the AJC reported.