8805
The bomb was found after analysing old aerial photographs while searching for unexploded bombs dropped by Allied aircraft over Germany 's industrial Ruhr region .
 location: Germany; location: Ruhr
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Germany; location: Ruhr