Here is another article, Moody. It looks like a small fire broke out and when water was sprayed on it, due to ammonia nitrate, the plant exploded.

http://blog.al.com/wire/2013/04/texa...t_explode.html

I hope the Texas curlies are okay. Based on this article, several fire fighters and near by residents were injured.
When I hear terms like "hipster" I think, who told cliques they could leave high school??