1165
Procedural improvements such as specific flight crew training , altering air traffic procedures to minimize exposure to the threat , and improved security near airports may be less costly than countermeasures and could more immediately help deter domestic terrorist attacks .
 terrorist: 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:
 terrorist: attacker