Unknown people threw a bicycle from a bridge onto a street in Dortmund and subsequently injured a 19-year-old with a knife.
The police reported on Sunday that they were probably three young men.
Accordingly, they threw the bike off the bridge on Saturday night.
When the 19-year-old asked her about it, one of the trio hit him with his fist and pulled out the knife.
Dortmund - The young man came to a hospital, the strangers fled.
The investigation into dangerous bodily harm continued on Sunday.
According to the police, the 19-year-old was not at risk of death.
dpa
