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NATO forces released a group of Bosnian Serb policemen late on Thursday and a tense confrontation appeared to be easing , an alliance spokesman said .
 Bosnian Serb, NATO
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 Bosnian Serb, NATO