frankfurt around 60,000 inhabitants germany financial capital frankfurt order leave home sunday large world war two bomb discover build site make safe police say germany central bank bundesbank frankfurt goethe university least two hospitals also evacuate one large evacuations german post-war history 1.4-tonne hc 4000 bomb drop british air force world war two uncover build site wismarer strasse frankfurt leafy westend many wealthy bankers live bomb disposal experts examine say massive evacuation could wait weekend still work modalities evacuation plan spokeswoman frankfurt police say wednesday frankfurt evacuate 60,000 people defuse british wwii bomb