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Yahoo ’s board has blamed unnamed senior executives and its legal team for failing to properly investigate a 2014 security incident which saw 500 million user accounts stolen by state - sponsored attackers .
 data breach: a 2014 security incident
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 data breach: a 2014 security incident