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The Japanese terrorist cult Aum Shinrikyo -- which launched the infamous Sarin gas attack on the Tokyo subway system in 1995 -- was discovered to have experimented with the use of lasers as weapons . According to The Asian Pacific Post , " Cult members apparently obtained laser design information from Russian institutes they visited and built a laser weapon mounted on a truck .
 ( attack: attack,  which: attacker, Tokyo: place, system: target, gas: 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: attack,  which: attacker, Tokyo: place, system: target, gas: instrument) 