A North Carolina high school has recalled its yearbooks after officials were alerted that a Confederate flag appeared on its cover.

Thomasville City Schools said in a statement shared on Facebook on Wednesday that all of the Thomasville High School yearbooks were collected after officials were informed about the "inappropriate picture."

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The picture in question was included in a collage of photos that showcased the school's history. According to the school, a picture "used from the class of 1968, had the words 'Go Dogs' being held in front of the Confederate flag."

"Swift action is being taken to remove the picture from all yearbook covers and provide new books to students and staff," the statement concluded. "We apologize for such an egregious error and vow to have a system in place to prevent such mistakes from happening again."

Superintendent Catherine Gentry told The Dispatch that just more than 10 people had seen the yearbook before it was recalled. She added that student yearbook staffers and a school advisor did not notice the Confederate flag before finalizing the cover.

“I’m not sure what the reason was, whether it was missed, whether it just did not stand out during the proofing process, there could be a million reasons. It was not something that was caught by the students or the teachers or that stood out to them,” Gentry said. “I don’t have any sense that it was malicious or intentional. I also don’t want to blow this off as something that is not important, because it is important.”

The superintendent said the move to reprint the yearbooks was influenced by the “controversial and sensitive” nature of the Confederate flag.

Insensitive imagery appearing in yearbooks has prompted some outrage in recent months. A California high school earlier this month apologized for including Spanish teachers wearing ponchos, sombreros and fake mustaches in its yearbook.