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Power grid. >> they may be getting ready for a cyberattack to cripple the united states. jim sciutto has more on what is at stake. >> reporter: vital u.s. infrastructure including the power grid under cyber threat by russian government hackers. potentially giving the kremlin the ability to turn offer t the lights. department of homeland security and the fbi detailing a two year multistage effort by moscow targeting the u.s. energy grid. the hackers first gained access to small energy related companies, planting malware that allowed them to move into larger networks. once inside the energy supp...

Have a sick passenger. specially useful when we are out of the hf range. >> you also mentioned the engines transmitted data independent of what the pilot is doing. >> just to say what their p parameters are at the time. >> the important thing to remember, shutting those systems off, the radio and the acard system off, that is not easily done, it is not an on/off system. >> if you are going to shut down, we call this box, the fmc, you have to have an intimate knowledge of the architecture of this system. it is not an on/off switch. you have to go in there. it is many key strokes to delete the f...

>> that says to me it is very unlikely this was a mechanical failure or an electrical failure or any failure. that says to me that somebody on board this airplane and the flight deck deliberately tried to turn those systems off. why? i don't know. it is something you would never, ever do. it is unheard of. we talk about the redundancy that is built into this aircraft. it is meant to fly long distances over vast, empty oceans. everything is backed up, backed up, backed up. there are at least six backups from the power systems if there would be some kind of failure. i believe, mitchell, we said ...

He's clever. i would guarantee he's turning all these systems off. he's going to shut down everything that emanates a signal and intentionally go to black. makes it more difficult for us to find him. >> now, that said, we probably would know where these facilities are already even if they've gone dark now. so say we're talking about something like a radar facility or some kind of command and control structure out there. would we hit it anyway? and what would be the result? >> tom, we would. all of these fixed facilities are in the target list. they will be attacked. but until we put a human in...