What do you explain these explosions on the Fukushima site? could this be the core hitting ground water?

This You Tube video asks if these are friendly fire? I truly doubt that is the case? Are these the other reactors or are these explosions in nearby abandoned residences? Any thoughts?

http://www.youtube.com/watch?v=VrGhQyDZ7fw

Good find. We're all on

Good find. We're all on edge - and who trusts TEPCO? So it's easy to project the worst.
However, I would certainly like to know what happened. We have a right to know why there APPEARS to be explosions in such a vulnerable and dangerous area.
Sure hope it's a simple and innocent explanation. But again, who trusts TEPCO?