PESHAWAR - A tribal elder was killed and three other persons sustained injuries in a bomb blast in Bajaur Agency yesterday. Officials of the political administration told that an Improvised Explosive Device (IED) planted along a roadside by some unidentified miscreants at Khar headquarters of the agency went off with a big bang. Resultantly, one tribal elder identified as Qadir Khan was killed on the spot and three others Malik Waseed Khan, Gulab and a minor Safia sustained injuries.