e.o.d. tech from the publicly available photos of scene show a lack of soot on the the walls, relatively little amount of shrapnel, there is a tree that was knocked down that was -- with the foilage still in act. so after viewing these things, do you still stand by with a high degree of confidence there was a significant explosion and not something like a gas tank explosion or something like that that may misdirect the evidence of a big secondary explosion? >> we know that, as i said earlier there was a secondary explosion. that assessed that what was there was going to be used in a high profile attack. i don't have details on the -- the information that you're just saying, but our intelligence experts and the cent com will continue to assess the post