Sindh : Suicide bomber in northwestern Pakistan killed at least three , authorities say . Punjab : He blew himself up after running out of bullets in gunfight , police say . Pakistani police say they stopped plot on government buildings . Three men tried to carry out attack , says Interior Minister Rehman Malik .
NEW : Suicide bomber in northwestern Pakistan kills at least three , authorities say . NEW : Suspect blew himself up after running out of bullets in gunfight , police say . Pakistani authorities say they stopped plot on government buildings . Three men plotted to carry out attacks , says Interior Minister Rehman Malik .