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Further ReadingYahoo admits it ’s been hacked again , and 1 billion accounts were exposed " When I learned in September 2016 that a large number of our user database files had been stolen , I worked with the team to disclose the incident to users , regulators , and government agencies , " she wrote in a note published Monday on Tumblr .
 ( data breach: the incident,  users: victim) 
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: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( data breach: the incident,  users: victim) 