KHYBER AGENCY : An armed person of Tauheed-ul-Islam (TI), Zakha Khel Peace Lashkar, was killed in planted explosive device blast here in Zakha Khel area of tehsil Landikotal, official and local sources informed on Tuesday. The sources said that the volunteer was struck by heavy intensity improvised explosive device (IED) planted by unknown militants. The identification of the deceased could not be ascertained till filing of this report.