Originally Posted by
fishinhunter
Based on what you described I'd say someone shot some Tannerite. It's marketed as an exploding target. You mix two parts together, then you have to shoot it to set it off. The more you use, the louder it gets. You can blow up just about anything you want with it...refrigerators...vehicles. You use enough and you can make a tremendous amount of noise and/or destruction.
Thats just my guess based on what you described...a gunshot followed by a loud explosion is exactly what Tannerite sounds like.