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In the past , denial of service attacks have been perpetrated by customers with a grudge or by blackmailers , but there is no indication from Lloyds that a ransom demand was received .
 denial of service attacks have been perpetrated: attack pattern; Lloyds: victim; blackmailers: attacker; customers: 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:
 denial of service attacks have been perpetrated: attack pattern; Lloyds: victim; blackmailers: attacker; customers: attacker