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The nuclear crisis flared last October when U . S . officials said North Korea admitted running a secret nuclear weapons program in violation of a 1994 accord with Washington .
 U . S, North Korea, Washington, U . S . officials, nuclear weapons
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:
 U . S, North Korea, Washington, U . S . officials, nuclear weapons