2694
But “ recent attacks on hospitals have demonstrated how profitable ransomware can be when used to hold operationally critical assets hostage with the threat of human harm , and reports suggest attackers are beginning to shift their focus on ICS networks ” .
 ( ransom: recent attacks,  hospitals: victim, ransomware: tool, hold operationally critical assets hostage with the threat of human harm: 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: recent attacks,  hospitals: victim, ransomware: tool, hold operationally critical assets hostage with the threat of human harm: attack pattern) 