US retail chain Walmart has apologised after baking a cake containing the flag of ISIS.

A spokesman for the company told ABC News that it was sorry for the error, which occurred after staff at a local store failed to recognise the image. “An associate in a local store did not know what the design meant and made a mistake. The cake should not have been made and we apologise,” the spokesman said.

The cake was ordered by customer Chuck Netzhammer after his request for a Confederate flag cake was rejected by a local store in Slidell, in the state of Louisiana.

In a video posted on YouTube that has picked up more than 450,000 views, Netzhammer is seen railing against the store for failing to honour his original order, and asking whether the company supports the armed group.

Read More: aljazeera