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But for five and a half years , he noted , Annan " refused to accept any responsibility for the Rwandan holocaust until Mr . Gourevitch and others revealed that less than 5 , 000 U . N . troops could have stopped the killings if Mr . Annan had not closed his eyes ."
 Rwandan: place
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:
 Rwandan: place