A twitter user, Ismail Kidd Noorazi, first posted the picture that sparked outrage. Above the case, a sign boasted, "Own the school year like a hero".
"This is frightful. We removed the sign as soon as we found out about it".
People cried foul on Twitter and demanded an explanation from Walmart.
Walmart, one of the largest seller of firearms in the United States, condemned the sign on Twitter and said action had been already been taken.
Wal-Mart said one of their managers "confirmed there was no such sign" at the location where it was allegedly seen. Walmart corporate said it didn't mean any disrespect and the display was quickly taken down. "We regret this situation and are looking into how it could have happened", he said in a statement. Last September in Florida's Panama City Beach, a Walmart store attempted to commemorate the anniversary of September 11 by stacking Coca-Cola boxes into the shape of the World Trade Center buildings.
Real or fake, the ordeal has kept Walmart's social media team busy for more than eight hours (and counting) Wednesday night.
In October 2014, the store apologized for labeling a cloth category for adult plus size Halloween outfits, "Fat Girl Costumes". The step was taken after the flag became a sore point in the aftermath of a shooting at a historic African-American church in Charleston. The retailer selling athletic footwear, apparel and accessories had named the range of shoes "Zenji".