A bus driver was fatally injured in a knife attack in Upper Franconia.
The 63-year-old intervened early Tuesday morning when a 43-year-old attacked and slightly injured a passenger from a Polish tour group in Hof.
The suspect is said to have inflicted fatal injuries to the bus driver with a knife, the police and public prosecutor announced.
The 43-year-old German from Saxony is currently being questioned, said a police spokesman.
He was expected to appear before a judge later in the day.
The criminal police also used interpreters to interview some of the passengers who had witnessed the attack.
According to the investigators, the dispute had come about when the Polish tour group took a break with the two buses at the train station in Hof.
Some of the passengers smoked on the sidewalk next to the buses.
Several passengers got into an argument with the 43-year-old who was nearby.
After the knife attack, he fled on foot.
A patrol was able to catch him near the crime scene.
The travelers made an emergency call immediately after the attack and provided first aid.
An emergency doctor could no longer help the 63-year-old.
He died on the scene.
The background to the dispute was initially unclear.
The police cordoned off a large area of the crime scene.
Criminal police specialists secured traces.
According to the police, a bus has already been able to continue its journey.
It was initially unclear when the other could continue.