583
North Korea , which is seeking a guarantee from the United States that it won ' t be attacked , ratcheted up the threat of conflict in a statement issued by its official Korean Central News Agency accusing Washington of escalating tensions .
 United States: 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:
 United States: attacker