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Two security officials and two state-paid village guards were killed in the fighting with Kurdistan Workers Party ( PKK ) guerrillas , the agency quoted the emergency rule governor 's office as saying .
 Kurdistan Workers Party, PKK
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:
 Kurdistan Workers Party, PKK