A bomb exploded at a local bus-stand here on Sunday evening injuring three people, said Quetta's Senior Superintendent of Police Ghulam Muhammad Dogar. An Afghan man had been carrying the explosives for "sabotage purposes", he said. Tribal militants blew up a pipeline supplying a major gas distribution plant on Sunday, said Dera Bugti District Coordination Officer Abdul Samad Lasi. The pipeline supplied gas to the plant in Dera Bugti from the Loti gas field, he added.