If any of the “Military style explosives” remain unexploded investigators should be able to tell its origin. If American produced should be able to trace.
Also I am now wondering about the bombs that were used at marathon, I read that they were black/gun powder for accelerant.
If you are a terrorist and have access to “military explosives” why are you making a bomb with black or gun powder.
Perhaps ? that was the only thing available or not available from their enablers at the time and the situation got out of hand and their enablers ( the Saudis ) skipped out on them with the money and all ( after all ? a high ranking Saudi official came unannounced and took one of their fellows home on a airplane ) and left them do the dirty job on their own ?
Why was the first suspect rushed out of this country ? and a Saudi official was brought into this country unannounced ?