Gas supply to the Sui Power Plant was affected after unidentified men blew up two main gas pipelines in Peer Koh area of Dera Bugti district on Tuesday, sources in the district administration said. They said the men had planted explosives under the 20-inch and 16-inch diameter pipelines, supplying gas to the Sui plant from the Peer Koh gas field. The resulting explosions severely damaged portions of the two pipelines.