One needs an expert that can examine size, scope, and chemical residue of the explosion. This requires on-site examination. The video posted that I saw is terrible inadequate to pinpoint the exact location of the blast. Even the Alfred Murray building had more information than this one. And the damage to the Murray building was most definitely not from a fertilizer bomb. In an era of vastly improved video technology, has any one noticed how grainy the video are in events like this? This is a indication of a cover-up.