3024
Accoridng to a press release , once the Cockrell Hill Police Department became aware that files on the server had been corrupted by a computer virus , they immediately disconnected the server and all computers from the internet and all state database systems and were able to contain the virus .
 ( data breach: had been corrupted,  a computer virus: tool, the Cockrell Hill Police Department: victim, files: compromised data, the server: 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: had been corrupted,  a computer virus: tool, the Cockrell Hill Police Department: victim, files: compromised data, the server: victim) 