explodes. more than 100 firefighters respond to the disaster but there's little they can do besides let the fire burn itself out. missile parts litter the road. officials say the explosion is actually caused by the truck's gas tank rupturing, not the solid rocket fuel which burns up in the fire. fortunately, everyone inside the tunnel is able to make it out before the blast, and there are no casualties. january 18th, 2011. a tv news cameraman's videotaping workers responding to a gas leak in the tacony neighborhood of philadelphia when all of a sudden, the ground erupts. >> all you see is just this flash of light and this giant plume of smoke just rocket up