PATNA, Nov. 3 -- One person died and at least six were injured following an explosion in a leaked gas pipeline on Monday, shockwaves from which severely damaged a four-storey building and shattered windowpanes within a 100-metre radius, officials said. The injured were brought to Patna for treatment, officials said. The incident occurred around 12 noon. "Local people reported that a JCB was working near the PNG pipeline. Suddenly, a blast occurred during this time," said a senior district administration officials. Muzaffarpur senior SP Kantesh Mishra said, "A drain construction project was underway in Gobarsahi under Sadar police station limits. During the work, the PNG gas pipeline was damaged at around 12:15pm, resulting in approximately five people being injured, one of whom has died. Another person is seriously injured and is undergoing treatment, while the remaining injured have been reported to be out of danger. After the investigation, action will be taken against those found responsible for negligence." Officials said a four-storey building was severely damaged, while windowpanes of several houses within a 100-metre radius were shattered. Several vehicles were also damaged in the blast. Police coordinated with the State Disaster Response Force (SDRF) and Indian Oil experts due to the technical nature of the gas leak. According to investigation, drain construction work was being carried out by the RCD. While digging was underway using a JCB, the PNG pipeline got damaged, which subsequently caught fire and triggered a blast. "All the injured have been admitted to the nearest government hospital and sent afterwards to better facility. An inquiry has been ordered to ascertain the cause of the incident and fix responsibility," said Muzaffarpur DM Kumar Gaurav, adding that one person has died and six injured. One of the injured has suffered 80 percent burns and rushed to Patna for treatment while others received 20 percent burns, according to DM. The blast sound was heard for three kilometres. According to local Jitendra Shahi, several houses and many vehicles in the vicinity have been damaged after the explosion. A four-storey building was severely damaged in the blast, while the windows of many houses within a 100-metre radius have shattered. The sudden blast left people in panic and they rushed out of their homes....