A Gwinnett County schools spokeswoman told The Atlanta Journal-Constitution an investigation was being conducted into two incidents at Sweetwater Middle School in Lawrenceville involving eighth-grade social studies teacher Stephanie Hunte.
Another teacher saw the students preparing for a re-enactment last Thursday and told an administrator, the newspaper reported Wednesday. School officials learned another class had a similar activity the day before.
"The administrator told [Hunte] that this type of activity was not appropriate and would not take place," spokeswoman Sloan Roach wrote in an e-mail message to the Journal-Constitution.
"As a result of this information, we have launched a human resources investigation into the matter."
Hunte, who has been employed by the district since August 2006, is black.
In the other case, Lumpkin County High School teacher Catherine Ariemma, who is white, says she never intended any offense by allowing students in an Advanced Placement history class to dress up as Klansmen. She says the costumes were part of a film re-enactment project she assigned the students.
Ariemma, a six-year veteran with the school system, told the newspaper she may have made a mistake allowing the filming on campus.