NEW : Suicide bomber in northwestern Pakistan kills at least three , authorities say . Militants in North Waziristan , part of the tribal region , have said they will observe a unilateral ceasefire throughout the month . The attack happened on the outskirts of Peshawar and was claimed by a Pakistani Taliban splinter group that has been fighting U.S. forces for years. 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 .
NEW : Suicide bomber in northwestern Pakistan kills at least three , authorities say . The attack happened on the outskirts of Peshawar and was claimed by a Pakistani Taliban splinter group that has been fighting U.S. forces for years. 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 .