The explosion, triggered by the rupture of a 20-inch gas main, occurred near Sissonville just before 1 p.m., Kanawha County Fire Coordinator C.W. Sigman said. Kent Carper, president of the Kanawha County Commission, said flames had been shooting 50 to 75 feet into the air before the fire was extinguished. "It sounded like a Boeing 757. Just a roar," he said. "It was huge. You just couldn't hear anything. It was like a space flight."