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It is suspected that Ukrainian - based hackers took the Cockrell Hill Police Department 's server for ransom last month , resulting in the loss of video evidence .
 ( ransom: ransom,  server: victim, Ukrainian - based hackers: attacker, last month: time, Cockrell Hill Police Department: victim, resulting in the loss of video evidence: attack pattern) 
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:
 ( ransom: ransom,  server: victim, Ukrainian - based hackers: attacker, last month: time, Cockrell Hill Police Department: victim, resulting in the loss of video evidence: attack pattern) 