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A bomb dating back to World War II has been found on the grounds of Frankfurt Airport on Friday.
Police said that it is a phosphorus bomb that was discovered during construction work.
According to the police, incendiary bombs containing white phosphorus were used on a large scale during World War II.
The bomb was to be detonated in a controlled manner in the late afternoon or evening.
Meanwhile, a radius of around 1,000 metres around the site was cordoned off in advance.
Neither air traffic nor the roads around the airport have been affected so far, a spokesman said.
There have been no evacuations.
dpa/NAN