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In interviews last year , Giuliani said Nathan gave him `` tremendous emotional support '' through his treatment for prostate cancer and as he led the city during the aftermath of the Sept . 11 terrorist attack on the World Trade Center .
 ( attack: attack,  terrorist: attacker, city: place, World Trade Center: target) 
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,  terrorist: attacker, city: place, World Trade Center: target) 