Several people were injured in a knife attack on a regional train from Kiel to Hamburg on Wednesday.
A man attacked travelers with a knife shortly before 3 p.m. before arriving at Brokstedt station, a spokesman for the Federal Police said on Wednesday the German Press Agency.
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According to initial findings, seven people were injured.
Police officers arrested the man shortly afterwards in Brokstedt.
The background is still unclear.
The station was closed for police measures.