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But for five and a half years , he noted , Annan " refused to accept any responsibility for the Rwandan holocaust until Mr . Gourevitch and others revealed that less than 5 , 000 U . N . troops could have stopped the killings if Mr . Annan had not closed his eyes ."
 attack: holocaust
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: declare bankruptcy, transfer ownership, marry, die, phone write, arrest jail, convict, sue, transfer money, end organization, start organization, end position, merge organization, start position, transport, charge indict, elect, attack, injure, born, extradite, release parole, sentence, demonstrate, meet, trial hearing, divorce, nominate, fine, appeal, pardon, execute, acquit 
Text: {0} 
Answer:
 attack: holocaust