Sony Music Japan made a very big mistake. A very big mistake. The label have now apologized after its all-girl band Keyakizaka46 performed in outfits that looked strikingly similar to Nazi uniforms.

There are 46 members of the Keyakizaka46 girl group, who performed in their military-style uniforms at a Halloween event on October 22. Sony was then forced to apologize for the hoards of people who were offended by the costumes.

"We express our heartfelt apology for causing offense, because of our lack of understanding," Sony Music Entertainment Japan said in a statement. "We take the incident seriously and will make efforts to prevent a recurrence of a similar incident in the future."