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The battle for Basra , an oil hub of some 1 . 3 million people , was underway by midday , with coalition troops trying to surround Iraqi positions and force a surrender .
 Basra: place; positions: 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:
 Basra: place; positions: target