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Those statements in contradiction to egyptian statements. what are investigators looking for? kyung lah is "outfront." >> reporter: the power of a bomb aboard a passenger plane. this demonstration by the u.s. attorney's office shows the end result. >> coming through the office. >> reporter: the beginning tracked by forensic bomb expert thomas anthony. >> is this a classic c-4 explosion? >> it is. less push and more force. we have less residue than a low explosive. >> reporter: starting with a c-4 bomb, he walks us through the impact of several types of bombs and the telltale signs they believe...

Video. they are marking the plane with what looks like some sort of a sophisticated magic marker. what are they doing there. >> you have to know where to look with this residue. to do that, you have to look for what is the initial fracture point in the fuselage. what they are doing there is looking at the metallergy, which way it's pointing. if it's from a bomb or any kind of internal pressure change, it's going to push that metal in certain ways and as it breaks, it makes a little indication. doing in the investigation, we - make arrows pointing to where that fracture point is leading us, whe...

Missiles to take down a flight traveling at 30,000 feet like flight 9268. experts worry commercial airliners could now be in their crosshairs. and erin, that's not just worrying for officials here in egypt but around the world. if isis is now viewing these as target that they are going to start going after. erin? >> ian lee, thank you very much, live at sharm el-sheikh tonight. and now, a former counterterrorism expert phil mudd is joining us. this group is possibly the most deadly part of isis but they have only been affiliated with isis for about a year. they have their own group and pledge ...

Throw off someone who you know is listening on your communications. >> reporter: isis in the sinai peninsula has shown bomb-making signals before and if isis is responsible for this, it would mark a significant step in their capabilities to launch further attacks. >> at this point, we don't have enough information to make our own determination about what exactly occurred but we do have enough information at this point to not rule out the possibility of terrorism. >> reporter: there is no indication so far that passengers or crew aboard the flight had any connection to terror groups so investig...

Intelligence saying a bomb likely took down flight 9268 but the egyptians are in denial. even today they promoted the man at the sharm el-sheikh airport. and ben carson as a young man, is it true that he was violent? wave special report tonight. at planters we know how to throw a remarkable holiday party. just serve classy snacks and be a gracious host, no matter who shows up. [cricket sound] richard. didn't think you were going to make it. hey sorry about last weekend, i don't know what got into me. well forgive and forget... kind of. i don't think so! do you like nuts? if a cold keeps you ...