A man attacked passengers with a knife on a train traveling from Kiel to Hamburg shortly before 3:00 p.m. local time before arriving at Brokstedt station. He was arrested shortly afterwards, a police spokesman said.
The station was sealed off by the police to allow emergency services to continue their work. Germany's state-owned rail operator Deutsche Bahn announced on Twitter that there would be train cancelations between Hamburg, Kiel and Neumuenster.
A spokeswoman for the police in Itzehoe, a city close to Brokstedt, said that further details remained elusive.