There is video of the blast. And prior to the explosion there WAS a pretty major fire going on there.
Here’s the amateur video:
http://www.youtube.com/watch?v=ROrpKx3aIjA
There’s another video somewhere on youtube that slows it down frame-by-frame. Needless to say, HUGE explosion.
Video here:
http://www.youtube.com/watch?v=M3iL2EhVsTs
Videographer was taping the fire when the major explosion occurred.