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In 1999 , East Timor became free , but only after Indonesian forces laid waste to it as they withdrew after a pro - independence referendum .
 forces: attacker; it: place
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: attack 
  Option: victim, attacker, place, target, instrument 
Text: {0} 
Answer:
 forces: attacker; it: place