KHYBER AGENCY At least four security personnel embraced Shahadat, while five others sustained serous injuries in a remote control bomb blast, here in Gurgori, Tehsil Bara Khyber Agency, on Saturday. Official sources said that forces were on their routine patrol, from Surdand to Gurgori. However, when they reached Gurgori, an explosive remote control device, planted by unknown miscreants, on the road detonated with a big bang. This resulted in death of four troops, on the spot, while five others, who were wounded seriously, were shifted to the military hospital for medical treatment. One vehicle of the forces was also destroyed in the attack. Soon after the incident, the reinforcement troops rushed to the spot, cordoned off the area and started a search operation in the area.