In a message to Linda Thompson  Steve Zimmerman wrote:
S   I was browsing your message and thought I might be able to shed some
S  light
S  on the possibilities associated with the blast that damaged the
S  building.  My
S  background is in military aircraft weapon systems (USAF retired) so
S  you know
S  I'm not making things up just to put something on the bbs.
S
S   Nobody knows (except the bomber) what form (structure) the bomb had.
S   Bombs
S  can be designed to direct their blast in a certain direction.  An
S  example of
S  this is the Claymore mine that was used in Viet Nam for perimiter
S  defense.
S  The blast was directed away from the defenders and against those who
S  were
S  trying to overrun the camp.
There is no indication from the debris and blast that is consistent with a 
directed blast from a truck on the street sufficient to have done any damage 
to the building.
There is every indication from inside the building that there was a blast 
directed outward that blew debris for blocks.  
 
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