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He posed in 1917 as a German baron and diplomatic courier Walter von Rautenfels and was arrested for espionage in Norway and planning of sabotage in favour of the German Empire during World War I , when several suitcases with explosives were discovered , covered as diplomatic luggage .
 Walter von, German Empire
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Walter von, German Empire