Nearly 13,000 residents were evacuated from Potsdam city centre on Friday after a Second World War bomb was found in the Havel river.
Among them were more than a hundred residents of a nursing home located close to the site.
«We just received a notification from the city administration that it has been decided to detonate the bomb rather than defuse it,» said Deputy Mayor of Potsdam Brigitte Meier.
She continued: «It will take some time before we make preparation for a controlled explosion before we prepare straw. The Agency for Technical Relief is building huge balls out of a straw in order to place them later on the bomb to contain the blast in the river.»
A 250kg (551 pounds) bomb from the Second World Two was discovered during a routine search.