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BALTIMORE — The hack that forced Baltimore ’s 911 dispatch system to be temporarily shut down over the weekend was a ransomware attack , city officials said Wednesday .
 over the weekend: time; Baltimore ’s 911 dispatch system: victim
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:
 over the weekend: time; Baltimore ’s 911 dispatch system: victim