The principal damage to the Alfred P. Murrah Building was brought about by explosives placed on five columns of the Murrah Building, according to the Pentagon report, and not by the ANFO bomb in the truck supposedly driven by McVeigh. Thus, until the individuals who placed the explosives on the columns of the Murrah Building are identified, any proposed explanation of how the bombing came about is woefully inadequate. The existence of demolition charges placed on some columns at the third-floor level of the Murrah Building is strongly suggestive of inside participation by at least some federal employees. I spoke to both experts, but they declined to be interviewed, citing confidentiality agreements with the Pentagon. Partin's report showed that the pattern of damage to the Murrah Building was inconsistent with the ANFO truck bomb as a point source for the explosion, and that the damage sustained by the columns could not possibly have come from this source.
Explosive pressure drops off approximately with the cube of the distance.
If the 4800 pounds of ammonium nitrate in the Ryder truck bomb were in a compressed sphere and detonated from the center, it would have generated a blast wave with an initial pressure of about 500,000 pounds per square inch. By the time the nearest Murrah Building column was reached, that pressure would have fallen to about 375 pounds per square inch. The rows are about 35 feet apart. The columns are 20 feet apart within each row. General Partin's report shows strong evidence of such contact explosive charges placed on columns B3, A3, A5, and A7.