Originally Posted by
ND Sol
That was already answered previously.
We know, but at what point? How about the question of whether he traveled with the C4 on the outbound?
BTW, C4 is a heavy duty explosive, but it is very stable such that you can pretty much hit it, light it and throw it without an explosion occurring (unlike the liquid explosives that were purported to be the subject of the "liquid bomb plot").
There was a fairly recent Mythbusters episode where they did just that--light it on fire. This was under the supervision of a bomb tech, they weren't being reckless.
They even tried robotically stomping on it while it was on fire, no boom.