QUETTA: Suspected tribal militants blew up two state-owned gas pipelines on Friday in Balochistan, disrupting supplies but causing no casualties, a company official said. No one claimed responsibility for the separate pre-dawn attacks in Sui, 350 kilometres east of Quetta, in Pakistan's restive Baluchistan province. Tariq Zubairi, a spokesman for the Sui Southern Gas Pipelines Ltd, said engineers had started repair work. He refused to speculate on who was behind the bombings, but authorities have blamed supporters of Nawab Akbar Bugti for similar attacks against pipelines and security forces. "We only know that bombs were used to blow up the pipelines," he said. The latest attack came a day after a bomb damaged a pipeline in Sui and killed a 7-year-old girl. It also came a day after dozens of alleged supporters of Bugti laid down arms after talks with pro-government tribal elders.