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But pilots are troubled by the incidents , and the FBI earlier this month warned of the possibility that terrorists might use the devices as weapons .
 the FBI, pilots, terrorists, 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:
 the FBI, pilots, terrorists, weapons