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A security source said four people were killed and many others were seriously injured in a heating system explosion this evening Wednesday in Paris .
 Paris, A security source, four people, many others
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 Paris, A security source, four people, many others