US retailer Walmart has apologised after a picture emerged of a gun cabinet in one of its stores beneath a sign reading "own the school year like a hero".
The image has been widely shared on Reddit and Twitter, with many users questioning how it had happened.
In recent years, the US has seen a number of deadly school shootings.
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Charles Crowson, a spokesman for Walmart, told the BBC: "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."
We hear you. 😞 This was horrible and we removed the sign as soon as we found out. -Vik— Walmart (@Walmart) August 9, 2017
On Reddit, commentators speculated whether the sign had been placed on top of the weapons cabinet by a member of staff or a customer, and done so on purpose or by accident.
By the BBC UGC and Social News team