An estimated 50,000 people are to be evacuated from Hannover on Sunday to allow a series of World War Two bombs to be defused.
The mass evacuation, the second largest in German history, will see around a tenth of the city's population leave their homes. It is hoped that the operation will take less than a day, The Local reported.
So far five devices have been located and it is estimated there are 13 locations in the Lower Saxon capital.
Residents have been told to switch off electrical and gas appliances as a precaution.
Trains are being diverted away from the area as an additional safety measure.