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I found the following report that was presented to Congress recently about the shoulder launched missle threat to airliners , which this might very well be a precursor to : Recent events have focused attention on the threat that terrorists with shoulder fired surface - to - air missiles ( SAMs ), referred to as Man - Portable Air Defense Systems ( MANPADS ), pose to commercial airliners .
 ( attack: threat,  airliners: target, missle: instrument) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: declare bankruptcy, transfer ownership, transfer money, marry, transport, die, phone write, arrest jail, convict, sentence, sue, end organization, start organization, end position, start position, meet, elect, attack, injure, born, fine, release parole, charge indict, extradite, trial hearing, demonstrate, divorce, nominate, appeal, pardon, execute, acquit, merge organization, Arguments type: beneficiary, prosecutor, plaintiff, seller, victim, buyer, agent, destination, artifact, organization, recipient, person, place, origin, target, giver, adjudicator, attacker, vehicle, defendant, entity, instrument. 
Text: {0} 
Answer:
 ( attack: threat,  airliners: target, missle: instrument) 