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Sony Music has apologised after one of its Japanese girl bands caused uproar by appearing at a concert wearing Nazi-themed Halloween costumes.

Keyakizaka46 went on stage in Yokohama on 22 October wearing black capes and caps resembling those of SS officers

Social media users were quick to point out similarities with the uniforms of Hitler's brutal paramilitary force.

Sony Music Entertainment (Japan) said in : "We express our heartfelt apology for causing offence."

It blamed "our lack of understanding" for the incident, which had prompted to demand an apology.

The band is a sister act to the country's popular AKB48 super group. Both are produced by Japanese hit-maker Yasushi Akimoto, an executive board member of the Tokyo 2020 Olympics committee.

In a he also apologised for his "lack of oversight", saying he had not been aware of the clothing choice before the performance and that he did not think the designers had intended the Nazi parallels. Staff will be better educated and outfits will be checked in future, he said.

With Japan determined to make a good impression in 2020 despite spiralling costs and scandal, the girls' outfits (in Japanese) that the Games' opening ceremony was being prepared with a bit more care.

Ignorance of the offensiveness of Nazi iconography is surprisingly widespread and , and commentators have suggested the mostly teenage pop stars themselves were unaware of the significance of their striking look - one that Sony in Japan has had to apologise for before, when boy band Kishidan appeared on TV in similar uniforms in 2011.