There were 11 men and nine women aboard, including an Austrian couple and their son, police said.
The 1.8-tonne British bomb, which German media said was nicknamed "Wohnblockknacker" -- or blockbuster -- for its ability to wipe out whole streets and flatten buildings, was discovered last Tuesday.
German police on Sunday evacuated 50,000 people from the northern city of Hanover in one of the country's largest post-war operations to defuse World War II era bombs.
Germany's rightwing populist AfD Monday moved to expel a state leader who argued the country should turn the page on its World War II guilt, exposing a deepening rift within the party.
Veteran British war correspondent Clare Hollingworth, who broke the news that World War II had started, died on Tuesday aged 105.
In a city obliterated by a US atom bomb more than 70 years ago, Japan kicked off a gathering of foreign ministers from the Group of Seven (G7) advanced economies with a call to end nuclear weapons.