A dispute over parking spaces in Hagen ended in a fight and stabbing.
Four men, aged 29, 40, 30 and 42 years old, were slightly injured and were taken to hospital, police and prosecutors reported on Friday.
The 30-year-old suffered cuts.
According to the information, the dispute on Thursday evening over the parking situation started with the four men who came from two neighboring families.
Hagen - It ended in a fight with around 20 people in which a knife was drawn.
Officials formed a police chain to separate the parties and bring the "tumult" under control, a spokesman for the prosecutor said on Friday.
Police detained two key people and seized a kitchen knife.
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dpa