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“ The defendants allegedly hijacked victims ’ computer systems and shut them down until the victims paid a ransom , ” said Deputy Attorney General Rod Rosenstein , speaking at a press conference in Washington D.C. “ Many of the victims were public agencies with missions that involve saving lives and performing other critical functions for the American people . ”
 the victims: victim; hijacked victims ’ computer systems and shut them down: attack pattern; The defendants: attacker
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: ransom 
  Option: victim, attacker, payment method, attack pattern, damage amount, tool, time, price, place 
Text: {0} 
Answer:
 the victims: victim; hijacked victims ’ computer systems and shut them down: attack pattern; The defendants: attacker