Walmart has condemned a display inside one of its stores that appeared to market firearms as back-to-school items. The company said Wednesday it was working to identify which of its stores put up the exhibit. A photo of a sign reading "Own the school year like a hero" was placed directly above a glass case filled with guns. Photos of it spread like wildfire on social media. People cried foul on Twitter and demanded an explanation from Walmart. One person asked: "What are you suggesting?" Walmart responded to some of the comments by calling the display "truly awful" and "horrible."