North Korean officials were left fuming when the South Korean flag was wrongly shown before the North Korean women’s soccer match in Britain. The North Korean team delayed the start of the game by one hour, but went on to play the match as planned.

The two Koreas are still officially at war.

The incident was investigated by the Olympic Committee, which chalked it up to “human error.” British Prime Minister David Cameron expressed regret, saying the incident was “unfortunate and should not have happened.”