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It ' s true , Hentoff said , that the U . N . issued a report in 1999 that acknowledged , to some extent , its role in the killings .
 its: attacker
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:
 its: attacker