On Monday afternoon, a young man, cursing and cursing, threw a silver object with wires on a table in the main customs office in Göttingen, thereby triggering a police operation.
The customs office and adjacent buildings were immediately cleared and the road in front of the authority was closed to passenger and vehicle traffic, the police said.
Göttingen - Experts from the State Office of Criminal Investigation in Hanover examined the suspicious object, but were able to give the all-clear after an hour.
The 20-year-old man drove away in a car unrecognized after his performance.
The police are investigating suspicions of "disturbing public security by threatening criminal offenses" against unknown persons.
dpa