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The International Atomic Energy Agency and other sources have warned that radioactive materials , such as caesium-137 , could be used in radiological dispersion devices , or " dirty bombs " .
 International Atomic Energy Agency
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 International Atomic Energy Agency