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The US Attorney 's Office for the District of Northern Georgia announced Wednesday that a federal grand jury had returned indictments against two Iranian nationals charged with executing the March 2018 ransomware attack that paralyzed Atlanta city government services for over a week .
 ransom: ransomware attack
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:
 ransom: ransomware attack