Around 8,000 people are being evacuated and roads to the airport closed after a WWII was bomb discovered by construction workers in the western German city of Dusseldorf.
The exclusion zone has been expanded to one kilometre, the city administration said.
The A52 and A44 motorways are affected, which means Dusseldorf airport is only accessible indirectly.
In a statement, the airport asked all travellers to allow an extra two hours for their journey to the airport.
The defusing could also affect flights at Dusseldorf Airport. The possibility that air traffic would have to be temporarily interrupted while the bomb is defused could not be ruled out, an airport spokeswoman said on Thursday morning.
The bomb has a chemical-mechanical detonator which is "quite dangerous," the police said.
The possibility that the bomb will have to be detonated on site cannot be ruled out, they said.
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