Around 65,000 Frankfurt residents have left their homes to for a day to let experts defuse a massive unexploded bomb from World War II.
This is the biggest evacuation in post-war German history.
Police have checked every designated house with heat-detection technology to make sure of complete evacuation.
The evacuation area in the Westend district includes hospitals, nursing homes and Germany’s central bank.
There are believed to be hundreds of thousands of unexploded wartime bombs across Germany.
The 1.4 tonne British bomb was found on Wednesday.Fire and police chiefs in the city warned that an uncontrolled explosion of the HC 4000 bomb would be powerful enough to flatten an entire street.
The bomb disposal operation is expected to take about 12 hours.