Officials from a Texas school district have reportedly opened an investigation after what appears to be Ku Klux Klan recruitment flyers were found in a high school bathroom.

A student at East Central High School in San Antonio found a flyer on Tuesday between a soap dispenser and the wall, CNN reports.

The black and white flyer shows a hooded figure on a horse, dressed in typical KKK robes and waving a torch above his head. The flyer reads: “Save our land, Join the Klan.”

The student then sent a photo to his mother, and she posted the picture on social media, where it caught the attention of district officials. The next day, the school opened an investigation into the incident and is working with the East Central Police Department and the FBI, according to CNN.

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A second person — a staff member — found another copy of the flyer in a boys’ bathroom, the outlet reports.

No other copies have since been found, with district spokesman Brandon Oliver saying the incident has been “completely isolated.”

It’s not known who posted the flyers, but school officials have vowed to “punish the individual” responsible, Oliver said, according to CNN.

“This behavior is not tolerated at East Central ISD and not reflective of our core beliefs and inclusive environment,” the district said in the statement, according to the Fort Worth Star-Telegram. “The individual will be caught and punished to the fullest extent of the law.”

The school is majority-Hispanic, CNN notes, and has about 16 percent white students and 9 percent black students.