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Riot police intervened after the protestors , who included hundreds of students from the American University in Cairo , rallied on the city ' s central Tahrir Square , close to both the university campus and the US embassy .
 Tahrir Square: place; protestors: entity
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: demonstrate 
  Option: entity, place 
Text: {0} 
Answer:
 Tahrir Square: place; protestors: entity