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There are hundreds of unmarked graves , apparently dating back to the 1991 Gulf War , or before , but it 's not clear whether the people buried there are victims of regime atrocities , or whether it 's simply a military graveyard .
 hundreds, 1991, Gulf War
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 hundreds, 1991, Gulf War