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seven iraqis were killed by u . s . marines , who say they were responding to sniper fire .
 u . s, seven iraqis, u . s . marines , who say they were responding to sniper fire, who, they, sniper
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, seven iraqis, u . s . marines , who say they were responding to sniper fire, who, they, sniper