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Inspectors also returned to a former helicopter airfield where Iraq buried bombs it says were armed with biological weapons in 1991 .
 Iraq, it, Inspectors, a former helicopter airfield, where, helicopter, bombs it says were armed with biological weapons, biological 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:
 Iraq, it, Inspectors, a former helicopter airfield, where, helicopter, bombs it says were armed with biological weapons, biological weapons