The spokesman also confirmed that “shots were allegedly heard” by onlookers.
According to social media reports, the incident took place near the station distract.
One person wrote: “Avoid the station district in #Frankfurt! She @FRlokal reports gunshots there in the city center.”
Shortly before 3pm local time, police said they had called a halt to the operation.
They said the alleged gunshot noises were actually stones that a stranger had thrown at the windows.
The person was provisionally arrested.
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Additional reporting by Monika Pallenberg