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American troops stormed a presidential palace and other key buildings in Baghdad as U . S . tanks rumbled into the heart of the battered Iraqi capital on Monday amid the thunder of gunfire and explosions .
 ( attack: stormed,  troops: attacker, Baghdad: place, palace: target, buildings: 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: stormed,  troops: attacker, Baghdad: place, palace: target, buildings: target) 