PESHAWAR – Three security personnel were killed and 21 others wounded when two terrorists rammed their explosives-packed vehicle into the wall of a military base in South Waziristan tribal region on Wednesday. According to official sources, the bombers detonated the vehicle outside the Zarai Noor camp – seven kilometres west of the agency headquarters Wana – after it was signalled to a halt. The sources added that the terrorists were targeted by security personnel when they crossed into the prohibited area. The blast was so powerful that it badly damaged the boundary wall of the base camp and several houses therein, besides killing three security officials, including an army captain. The injured were ferried to the agency headquarters hospital and combined-military hospital for treatment. Soon after the incident, a massive contingent of law enforcers rushed and cordoned off the area. High alert was declared across Wana and security checks were made stringent to avoid any further unwanted event. The attack comes a week after the assassination attempt on an anti-Taliban leader, Mullah Nazir, who warned the Mehsud tribe to leave Wana and areas of the Ahmad Zai tribe within five days. Wednesday was the last day of the deadline given by a jirga of the Ahmadzai Wazir tribe that accused militants of the Mehsud tribe of plotting the suicide attack on Mullah Nazir.