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The city assigned 2 , 000 police officers to the rally , including undercover officers who carried beeper - sized radiation detectors and other counter - terrorism equipment .
 The city, police, 2 , 000 police officers, undercover officers who carried beeper - sized radiation detectors and other counter - terrorism equipment, who
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:
 The city, police, 2 , 000 police officers, undercover officers who carried beeper - sized radiation detectors and other counter - terrorism equipment, who