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UK foreign secretary says apparent beheading of US journalist by Islamic State " appalling example of brutality " http://t.co/kMxlQZAq9v
 UK, US, Islamic State
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 UK, US, Islamic State