PESHAWAR, Pakistan The alleged mastermind of the 2014 attack on a school in Pakistan in which more than 150 people died, most of them children, has been killed in an American drone strike in Afghanistan, the Pakistan military and sources in the Pakistani Taliban said. General Asim Bajwa, director general of the Pakistani army's media division, reported the death of Umar Narai, also k**wn as Khalifa Umar Mansoor or Khalid Khurasani, in a message on Twitter. U.S.