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Efforts were to continue at the United Nations Friday to find a breakthrough in the diplomatic stalemate on Iraq , with Washington warning it could bypass the Security Council and go to war alone .
 it: 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:
 it: attacker