passenger. and based on the flash caught by a u.s. satellite as well as photos of the wreckage that it was likely military-grade explosives such as a c-4 that would be needed to cause a blast like this one. they also believe that a timer may have been used to detonate after take-off. this is far from a conclusion, a final assessment, but it is a puzzle they are trying to piece together from afar. this is where they stand now. i know that you re also, you mentioned that they say was an inside job not a passenger. do they have any sense as to who? was this someone who worked in cargo, catering, someone who didn t generally appear on the tarmac? do they have a sense? they ve been looking hard. they interviewed all airport staff that had access to this plane before take-off and they examined security camera footage. in that investigation, they have not found evidence of someone putting a bomb on this plane.
among the arsenal of this group is, indeed, c-4. that explosive that may have been used on the bomb on the aircraft last summer egyptian media reported the egyptian army captured a warehouse that contained ten tons of c-4 and tnt. ben wedeman, thank you very much. that s terrifying, ten tons. it could take half a pound or less to do this type of explosion. i want to talk more about what we are learning about the bomb. first this breaking news fell to you that egypt has now, and this is a significant move, accepting help from the ntsb in terms of this investigation. they previously rebuffed any assistance from the fbi or ntsb. how big of a deal is this? i m suspicious here. when you talk to the egyptians,
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 type of bomb they think was used to bring this flight down? u.s. intelligence is basically building a more detailed working theory here. without the forensic evidence they normally have with an investigation like this, access to the wreckage, to the bodies, u.s. intelligence officials more convinced it was a bomb that took this plane down. it was likely snuck onboard by someone with access to the p
protect your belongings. let geico help you with renters insurance. egypt now saying it will accept help from the united states on the metrojet crash investigation. the ntsb will be the first americans directly involved. it appears though that is strictly for the engines which were pratt and whitney. a military explosive was likely used to take down the flight. only explosives of that strength could have blown the passenger jet out of the sky. terrorists in sinai have easy access to those types of explosives, including c-4. they ve been used in other attacks. how difficult would it be to get them through airport security here in the united states? it is the crucial question tonight. reporter: can you spot the explosive? that s all it s going to look like to a screener. reporter: that is a half
we have this news reporting that egypt has accepted an offer from the ntsb to travel to egypt to visit that crash scene to take part in the investigation. this could be really an enormos step forward because what u.s. intelligence has lacked so far is access to that forensic evidence at the scene. that access, if it follows through, the ntsb, could allow a more defensive judgment from u.s. intelligence. thank you very much. i appreciate it. the breaking news we have now that the ntsb, egypt accepting their offer to help. obviously, that could be incredibly significant. egypt denied any involvement by american investigators. who is responsible for this crash? the name could be the new osama. reporter: he goes by the name of osama, a shadowy figure some