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Some of the participants at the meeting said it appeared the looting was organized , and some of those involved had keys to museum vaults and were able to remove items from safes .
 participants: 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: meet 
  Option: entity, place 
Text: {0} 
Answer:
 participants: entity