The defusing of the bombs comes within months of 54,000 people being evacuated from Augsburg after a British bomb was discovered during building work.
Hannover suffered badly during the war. On October 9 1943 1,245 people were killed and 250,000 left homeless after 261,000 bombs were dropped on the city.
Unexploded bombs continue to be discovered more than 70 years after the war ended.
In 2010 three bomb disposal experts were killed and six people injured in Göttingen after a device detonated while it was being defused.
• This article originally appeared on the Daily Telegraph