How come emergency vehicle were able to access the very street where the ryder truck sat on? It's a fact of physics that a bomb does the most damage to the surface it's directly in contact with, which in this case would be the street. Why wasn't the street more severly damaged than the murrah bldg?
That is the mystery -- I got the FEMA report several months ago, but haven't had time to study it. However, have long wondered how an explosion in the street could break concrete columns. -- U.S. Army FM 5-25, Explosives and Demolititions , says -- "It (ammonium nitrate ) is not effective as a steel-cutting explosive because of its slow velocity of detonation." [page 13].