That means migrant background.
And that is what the groups of thirty to fifty young people (a more strongly coded code word) had in common as it came to violent clashes with the police at a Volksfest in the little German town of Schorndorf. Other visitors at the Volksfest, these specifically of Iraqi and Afghan background, were arrested in connection with three cases of sexual assault.
Personally, I’m convinced that the victims provoked these attacks again. There’s a popular German saying here: Other countries, other customs. Germans are just a little slow when it comes to adopting these other customs, that’s all.
„Unstrittig ist, dass es am Freitag und Samstag insgesamt drei sexuelle Belästigungen gab und dass in diesen Fällen gegen Iraker und Afghanen ermittelt wird.“

Given that their is no link to an explaination:
Volksfest = (traditional) festival