The 500-kilogram British bomb was found during construction work and police were working to defuse it today evening. One runway at the airport Germany's busiest was closed for landings because planes weren't allowed to fly directly over the site, news agency dpa reported.
Landings were expected to be suspended altogether for at least a short time, it said, citing air traffic control.
A stretch of the A3 highway near Offenbach, outside Frankfurt, was also closed.