PESHAWAR, Pakistan - Pakistani security officials broke up more than a dozen militant sanctuaries in the Khyber tribal region this week and killed 23 fighters, they said, while tribal sources said pro-Taliban groups killed 20 pro-government militants.The Lashkar-e-Islam and Tehrik-e-Taliban Pakistan (TTP) militant groups attacked villages in the Tirah region and killed residents when they tried to stop them entering the area, the security officials said, requesting anonymity.Tirah is a maze of valleys on a route from Afghanistan to the Pakistani city of Peshawar.