Of particular interest is the bomb damage engineering assessment and conclusions in the third link. Interesting reading.
Between the days of February 28, 1993 and April 19th, 1993, called Branch >Davidians.
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>On April 19, 1995, the Alfred P. Murrah Federal Building, Oklahoma City,
>Oklahoma was bombed, causing extensive damage to the structure, the loss of 168
>innocent lives, the victimization of the families of those who lost loved ones,
>hundreds of non-fatal injuries, and substantial property damage in the
>vicinity. The media and the Executive branch reported that the sole source of
>the devastation was a single truck bomb consisting of 4,800 pounds of ammonium
>nitrate, transported to the location in a Ryder Truck and parked in front of
>the building. It is impossible that the destruction to the building could have
>resulted from such a bomb alone.
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"A vote for Kerry is a de facto vote for bin Laden." Strider