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These were the same kinds of documents that were stolen in a massive theft of sensitive files at the Office of Personnel Management , affecting more than 22 million government and military employees .
 data breach: were stolen
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: were stolen