CHAKWAL: Four persons of a sensitive department were killed on Thursday on Lahore-Islamabad Motorway in the Salt Range area when a heavy container turned turtle. The container was carrying explosive material from Wah Factory to Okara. On a steep turn the breaks of the container were failed and it was rolled over and turned turtle resulting killing of Driver Mazhar Abbass resident of Distt. Bhakkar, Abid Hussain resident of Karachi, M. Shafi of Distt. Sargodha and Malik Mahboob Ahmed resident of Attock were killed on the spot while Khurram Shahzad resident of Sargodha received multiple injuries. All the dead bodies and injured were shifted to Fauji Foundation Hospital Kallar Kahar. Kallar Kahar Police registered a case and started investigation. The accident occurred at 05:40 AM.