2552
Five huge explosions within the space of less than an hour as these planes drop these massive bombs on the Iraqi positions behind us .
 planes: instrument; bombs: 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:
 planes: instrument; bombs: instrument