The gas explosion that killed one person and injured 25 others in North Carolina also damaged a building that houses a rarely seen but world famous collection of Porsches. The Ingram Collection is housed next to the building in Durham that collapsed Wednesday. The structure that holds the German-made sports cars was extensively damaged. About half its roof collapsed. Details on any damage to the collectible cars have not been released. The Ingram Collection holds some important classics, said Rob Sass, editor-in-chief of Porsche Panorama, the official magazine of Porsche Club of America. "There are Porsches and then there are Porsches," he said. "If it's a significant car in the Porsche world, chances are they have one. They really enjoy a peerless reputation."