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Huge explosions were heard in different parts of Baghdad and air raid siren sounded throughout the capital city , they said , adding that Iraqi anti - aircraft artillery had begun to fire back .
 Iraqi: attacker; artillery: 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:
 Iraqi: attacker; artillery: instrument