The package was delivered Friday. An employee who opened the package saw wires in it and alerted police. The German news agency dpa reported that Berlin police spokesman Thomas Neuendorf said it contained "pyrotechnic material" that could have exploded.
In early December, officials said a package delivered to a pharmacy in Potsdam with a crude device made of wires, batteries and nails was part of a conspiracy to extort millions from delivery company DHL Express.
Berlin police wrote on Twitter there's a link between that case and Friday's package, not delivered by DHL, but gave no details.