Around 300 Yazidi took to the streets in the early evening. They were demonstrating against the attacks on members of their faith in Syria and Iraq and a religiously-motivated attack against their community earlier that day, Herford police reported.
According to The Local, the police decided to intervene after a large group of hooded people started attacking passers-by in the town centre, with at least one person injured. The police used pepper spray to control the mob, confiscating tools and one firearm, and took the details of 86 people involved.
The anger was touched off by a fight between five Yazidi and six radical Islamists in a restaurant near Herford train station at around 4pm. The restaurant was displaying a poster inviting people to join in a demonstration in support of the Yazidi in Iraq.
The 31-year-old owner of the restaurant and a 16-year-old schoolboy, both Yazidi, were wounded in the fight, which police said was fought with a knife and bottles.
Six people were arrested after the fight, most of them Islamist supporters from Chechnya and all of them known to the police.
The ISIS has been persecuting members of the ethnically Kurdish Yazidi, who mostly live around the town of Mosul in northern Iraq. Some Muslims call the Yazidi "devil worshipers" because they follow their own monotheistic religion.