I've found the video that doesn't necessarily show the explosion that Josh Powell started but it shows some of the data they got from the incident. Here's the video.
Personally, I think people like Josh Powell should be in prison, it's a shame he didn't survive. This shows us how screwed is our system; known criminals just walk free because of reasonable doubt?
What Josh Powell did with the explosion is just barbaric, I can't believe he had the guts to do it.