the dl doctors at that particularclinic do not have those credentials. the burning this morning after the train derailment in ohio. fire officials in columbus say they have ruled out sabotage or a terrorist attack. leaning more towards a mechanical failure. abc's alex perez reports from the scene of the explosion. [ explosion ] >> jesus [ bleep ]! >> reporter: a frightening boom and orange glow of raging flames visible as far as ten miles away. it was 2:00 a.m., sean wall had come home after working the late shift. he grabbed his phone and started recording. >> reporter: what did it feel like on your skin? >> it felt like standing next to a bonfire. standing next to it i mean putting your hand right there next to the heat and your skin is starting to tingle and feel as much pain as it could. >> reporter: it all happened after 11 cars of a massive