The incident took place when police approached a man acting suspiciously . NEW : Suicide bomber in northwestern North Waziristan kills Three , authorities say . NEW : Suspect blew himself up after running out of bullets in gunfight , police say . Muslim authorities say they stopped plot on government buildings . at least three men plotted to carry out attacks , says Interior Minister Ramadan .
NEW : Suicide bomber in northwestern North Waziristan kills Three , authorities say . NEW : Suspect blew himself up after running out of bullets in gunfight , police say . Muslim authorities say they stopped plot on government buildings . at least three men plotted to carry out attacks , says Interior Minister Ramadan .