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After a police officer arrived , the second bag exploded , seriously injuring him , the officials said .
 bag: instrument; him: victim
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: injure 
  Option: agent, victim, instrument, place 
Text: {0} 
Answer:
 bag: instrument; him: victim