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Despite the leaked details about the meetings , US officials publicly declined to confirm any of North Korea ' s announcements , with US State Department spokesman Richard Boucher saying comments made by North Koreans " require careful analysis . "
 US, North Korea, US, North Koreans, US State Department, US officials, US State Department spokesman, US State Department spokesman Richard Boucher
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 US, North Korea, US, North Koreans, US State Department, US officials, US State Department spokesman, US State Department spokesman Richard Boucher