KOHLU : Unidentified militants blew up four electricity pylons in Kohlu district of Balochistan yesterday suspending power supply to a vast area of the province. Levies sources reported that miscreants had planted explosives under the 11kv pylons in Maiwand area of Kohlu. The officials reached the spot and gathered evidence. A case was registered against unidentified suspects and search operation was underway for hunting the accused.