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The terror alert was raised to " Critical " after an alleged terror plot was foiled which involved blowing up at least a dozen planes from the United Kingdom to the United States in flight .
 United Kingdom, United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 United Kingdom, United States