2573
Well , at least three U . S . service members were killed today in an apparent suicide bomb attack at a checkpoint near the Haditah Dam northwest of Baghdad .
 bomb: instrument; checkpoint: place; members: 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: die 
  Option: victim, person, place, agent, instrument 
Text: {0} 
Answer:
 bomb: instrument; checkpoint: place; members: victim