Suspected tribal militants blew up a gas pipeline in the Dera Murad Jamali on Sunday, shutting supplies to a US and British-owned power plant for the second time this month, a government official said. A blast damaged a 24-inch diameter pipeline, cutting off gas supply to the nearby Uch private power plant. "It is an act of sabotage," Abdul Samad Lasi, a senior local administration official, said.Militants carried out a similar attack in the same region earlier this month, shutting down the plant. Lasi said that the 586-megawatt Uch power plant would remain closed until the pipeline, which is not owned by the power plant, was repaired, but could not say how long this would take.