Ghallanai - At least two persons were killed and two others including a security official were injured in landmine blast here early Friday morning. According to details, unknown miscreants had planted landmine in Saafi Tehsil of Mohmand agency which exploded with loud bang triggering panic in the area.As a result of the blast, two persons were killed on the spot while two others including a child sustained injuries.The injured were shifted to Agency headquarters hospital for treatment.The political administration said that the landmine was aimed at targeting security personnel convoy.