One security forces personnel was killed and five others sustained critical injuries in a landmine explosion in tehsil Safi of Mohmand Agency on Thursday. Official sources said that security forces were on routine patrol in tehsil Safi area of Mohmand Agency when a landmine planted by the roadside went off with big sound, killing one soldier at the spot and inflicting injuries on five others. The injured were shifted to nearby hospital for medical treatment. The security forces cordoned off the entire area and launched search operation to nab the perpetrators.