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At least three members of a family in India s northeastern state of Tripura were hacked to death by a tribal mob for allegedly practicing witchcraft , police said Thursday .
 mob: attacker; state: place; members: target
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:
 mob: attacker; state: place; members: target