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To prosecute and conclude a case because you may not have had that forensic evidence trail. because they weren't thinking along those lines, but i would hope that they did this, at least in a professional way. they are experienced investigators, so the immediate determination of what happened may not have been damaged. but the ability to prosecute is what may have been damaged. >> we're awaiting this news conference from cairo, an update on the investigation into the crash of a metrojet flight 9268, we have our reporters there in cairo, also in the airport. we have our aviation analyst, terror...

Victims. >> and hello and welcome to our viewers here in the united states and around the world. i'm natalie allen. >> and i'm george howell from world headquarters here in atlanta. "newsroom" starts right now. and a good day to you. we start this hour with the investigation into metrojet flight 9268. and for the first time, the u.s. president barack obama believes that it is possible that a bomb was on board that plane. but still egypt and russia, they say there is no evidence to support that theory. >> the plane bound for russia crashed in egypt's sinai peninsula, killing all 224 passengers ...

They stayed at the same hotel as some of the passengers killed on flight 9268. >> the night before watching the little girl dancing and their parents singing. and then the next day they weren't there anymore. so it was really, really sad for us. >> reporter: egyptian authorities want to show the world the tragedy won't happen again. so they took us on a tour of the airport but wouldn't talk on camera. they showed us security for both passengers and employees. every employee who enters this airport is required to go through the same security screening as passengers. the only difference, they're...

>> reporter: the ntsb determined first officer deliberately crashed the plane. the final seconds from the data recorder, you can hear him saying, "i rely on god" and begging him to help him pull up before the recording ends. this wasn't the only time in egyptian and western investigators delivered over the cause of the crash. >> in 2004, there was an accident off of sharm el-sheikh, a 737 crash. the bea, the french and the americans indicated that they believed it was pilot error. the egyptians did not agree and blamed it on some sort of mechanical failure. >> reporter: and other countries mak...

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...