RAWALPINDI – Chief of Army staff GeneralRaheel Sharif on Monday signed black warrants of four hardcore terrorists involved in the massacre at the Army Public School (APS) in Peshawar. According to the Inter-Services Public Relations (ISPR) here, these terrorists included MaulviAbdus Salam, son of Shamsi, Hazrat Ali, son of AwalBaz Khan, MujeeburRehman alias Ali alias Najeebullah, son of Gulab Jan and Sabeel alias Yaya, son of Attaullah.