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The fighting broke out between club - wielding members of the former ruler ' s clan and a rival group , he said .
 members: attacker; group: attacker; club: instrument
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: attack 
  Option: victim, attacker, place, target, instrument 
Text: {0} 
Answer:
 members: attacker; group: attacker; club: instrument