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US is accused of killing civilians in raid on al- Qaeda offshoot http://t.co/5mAAQyy3Jg ( AP ) http://t.co/bec8sg5w6U
 US, al- Qaeda, AP
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 US, al- Qaeda, AP