PESHAWAR - At least three personnel of security forces were martyred and two others got injured when militants targeted their convoy with improvised explosive device (IED) in the restive South Waziristan Agency on Tuesday. The sources said that an IED, apparently planted by the militants, exploded when a military convoy was patrolling in the jurisdiction of Qalandar Killi, some 60 away from Wana.. Resultantly, three security men were martyred and two others received injuries. A vehicle was also damaged in the explosion. The official sources confirmed the casualties in the incident. The security forces cordoned off the area after the incident.