During construction work, an English five hundredweight bomb was discovered in the Oberhausen district of Osterfeld on Thursday.
On the same evening, the munitions clearance service of the Düsseldorf district government was able to defuse the chance find, as the city announced on Facebook.
"After exactly 21 minutes the long-awaited call from the defuser came."
Oberhausen - Previously, buildings were evacuated within a radius of 250 meters around the danger area, in which around 800 people were reportedly.
A retirement home was also affected.
dpa