DERA BUGTI - A 16-inch diameter gas pipeline at Pirkoh was blown up here on Friday.  Levies sources said some unknown persons blew up the Pirkoh gas transmission 16-inch pipeline from well nos. 15, 21 and 27 to the purification plant, disconnecting supply of gas to the plant. Pakistan Petroleum Limited (PPL) sources said that repair work would start as soon as the security situation improves. –INP