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More breaking news tonight, the egyptian government says it will allow ntsb investigators to take part in the metro jet 9268 investigation. this would make them the first to be directly involved. also tonight u.s. officials believe they know what kind of explosive was used to take down the airbus as well as how it got on board and how it was detonated. our chief national security correspondent jim sciutto joins us with the latest. what are you hearing from u.s. officials? >> what they're doing now is building a more detailed working theory. this is without the hard forensic evidence you normal...

Tonight that is what likely brought down metrojet flight 9268, killing all 224 people onboard. the timer set for just enough time to blow the plane up soon after take-off. we are also learning tonight that officials believe the bomb was a military grade explosive, specifically a plastic explosive like c4. officials believe an insider with access to the airport planted the bomb. egyptian officials say they interviewed everyone with access to the plane including caterers. our chief national security correspondent is out front to begin our coverage tonight what more are you learning about the typ...

This was explosive made out of a sugar substitute. >> reporter: how much created this hole? >> 80 grams. >> reporter: not a lot. >> no. >> reporter: those homemade explosives don't look like much when going through this, again, older model airport x-ray machine. newer machines are more sophisticated and can distinguish suspect items more readily. that is the same half pound of homemade explosive being detonated. investigators believe with if a bomb was placed on metrojet 9268, it was likely done by circumventing normal airport security. even here in the u.s., there are concerns. last june the ...

That's why i switched from u-verse to xfinity. now i can download my dvr recordings and take them anywhere. ready or not, here i come! (whispers) now hide-and-seek time can also be catch-up-on-my-shows time. here i come! can't find you anywhere! don't settle for u-verse. x1 from xfinity will change the way you experience tv. good to have you back here on "new day." we'll have more on the republican debate in a moment. first, other news. this morning, egyptian officials confirming the ntsb will join the investigation into the crash of metrojet flight 9268. this as we learn more about how ji...

Transportation safety board's offer to assist in the probe. all of this coming as isis in the sinai peninsula releases a new video threatening more attacks. let's get right to cnn's barbara starr. she's live at the pentagon. barbara, what can you tell us about these new threats? >> jake, on the video the speaker expresses suicide bombers all just the latest challenge facing the cairo government in dealing with isis. egyptian president abdul fatah el sisi visited sharm el sheikh airport wednesday promising his government will hide nothing. >> translator: we will announce the results of the inve...