"The break-in was professionally planned and carried out: three as yet unidentified perpetrators used a drill to get to the vault from an adjoining room in the cellar of the building," police said in a statement.
The heist, which struck the customs office in the western city of Duisburg, took place on Sunday November 1.
Witnesses said they had heard drilling sounds at around 6:00 am. Three hours later, three men dressed in dark clothing and dark knit caps were seen w...lking in and out of the building to load objects into a white van with sliding doors.
Another witness noticed a man walking around the customs office before getting into a car and driving off in the same direction as the van.
Photographs of the man taken by the witness were published by police, who are offering a 100,000-euro reward for information leading to the arrest and/or conviction of the suspects.
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