Walmart is apologizing after a photo of a back-to-school store sign placed over a glass firearms display started rocketing across social media.

The sign at an unidentified store read “own the school year like a hero.”

One Twitter user had a simple question for Walmart, the largest retailer of firearms and ammunition in the United States: “What are you suggesting?”

The sign appears to be part of an ongoing superhero-themed marketing campaign that is not related to guns.

The photo appeared to create confusion within the company, whose explanation for the store’s location is at odds with a woman claiming to have seen and photographed the display.

Charles Crowson, a spokesman for Walmart, told The Washington Post that the chain’s operations team is working to identify the store in question, which involves looking for what Crowson said they have referred to as “patient zero” - the first photo of the display. Crowson said the display and the configuration of the store suggest the photo is legitimate. It was not clear whether the sign was placed there by an employee or a shopper.

“What’s seen in this photograph would never be acceptable in our stores. We regret this situation and are looking into how it could have happened,” he said in a statement. He declined to comment on whether Walmart officials acknowledged the connection critics were making between guns and mass shootings on school campuses.

Crowson also said early indications the sign was at a store in Evansville, Indiana, were incorrect.

Leeanna May, who told The Post she took the photo, disputes that assertion.

May said she was in Evansville on an early morning shopping trip Wednesday with her husband when they walked by the sporting goods section, where May spotted the display she called “disgusting.”

“We have already lost so many innocent lives to guns,” she said, adding that she drew an immediate connection between firearms and school shootings. May said she alerted store employees but could not find a manager.

“People don’t seem to honestly care,” she said.

Walmart’s Twitter account replied to dozens of angry comments about the photo. In what appears to be the first reply over the incident, the company’s account tweeted May, whose account is now private, at 8:17 am Wednesday morning to ask the location of the store.

“We appreciate you letting us know about this display. Which store location was this? -Vik

- Walmart (@Walmart) August 9, 2017”

“I’m happy to tell you our store manager Christina has removed the sign from the display. Thanks again for alerting us to this. -Vik

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- Walmart (@Walmart) August 9, 2017”

After May said that the store was in Evansville, the company replied at 9:33 am to say: “I’m happy to tell you our store manager Christina has removed the sign from the display. Thanks again for alerting us to this.”

Crowson did not immediately return a request for comment on the disparity between the company’s position and May’s claim.

The display is another marketing-related mishap for the megachain. In July, the company was blasted for using a racist term to describe a wig cap sold on its online store. The third party item’s color was listed as “n-- brown.”

Walmart also drew fire ahead of Sept. 11 last year, when a Panama City Beach, Florida, store used Coca-Cola products to build an American flag display with two black towers, signifying the World Trade Center under a banner image of the New York skyline with a message “WE WILL NEVER FORGET.”

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