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Despite a security crackdown over the weekend in Baghdad and an announcement that some 7 , 000 policemen had returned to their jobs since the end of the war , ordinary Iraqis still felt unsafe on the street with gunfire rife and police a near invisible presence .
 None
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:
 None