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Imbert was the chief negotiator over the six days of the Balcombe Street Siege , and when the situation ended peacefully with no lives lost and the terrorists under arrest , Imbert was noted as a possible high-flyer in the police force .
 Imbert, Imbert
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Imbert, Imbert