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The prosecution in the trial of accused boston marathon bomber dzhokhar tsarnaev nearing the end of its case. in court monday, jurors heard testimony about the communications devices. cnn's alexandra field has more. >> reporter: his devices, laptop and cell phone come under the microscope. showing the jury only the most incriminating files on tsarnaev's computer. including instructions on how to make a bomb. the defense grilling an fbi witness on cross exam asking if they can tell who created the files and if a computer had more than one user. suggesting it was used for typical teenage activit...

That something was up. but he also has a radio and you make a mayday or pan call. pan, pan, pan, or mayday, mayday, mayday and takes about a nan oa nano second to do that and they didn't do that. >> don, in terms of what happens next. if the plane is never found and later assume our intelligence is where it is today that there is no -- we never determine a cause for this crash, we never find the plane. one would still assume that certain safety measures will be taken in the aftermath of this, which is to say are you optimistic that black box technology, for example, will be either standardized...

Last few minutes, all your sources are telling you the plane was manually -- had to have been manually turned and that perhaps based on what the succession of communications devices being turned off, that likely two people had to have somehow been involved. someone to remain in the cockpit, someone to go below and turn off one of the communication devices. >> certainly more than one person. it's very unclear who they are, where they were headed, what their purposes were. it's very unclear where the plane is currently. there's only one incontrovertible fact in all of this speculation. if aircra...

Dropping at over 20 feet per minute. we're about selaskboulaska sell. and so the plane would be ripping apart. >> we're going so fast. the fact that after that, the reportedly, the plane somehow levels off, that's what's really hard to believe and then to even try to contemplate what's going on back in the passenger section. the g-forces, the extreme sensations they'd have, it could almost be lethal for the passengers back there. and then we start talking about other factors, "the wall street journal" is reporting they believe there could have been two conspirators here. one who is flying the ...

And when and for how long. this request by the nsa was requested by the u.s. telecoms. that has meant the nsa has been in effect holding the bag on one of the most controversial elements of the domestic surveillance programs. general alexander also made the case these programs need to have a high level of secrecy because the terrorist threat from overseas is reaching deep inside the united states. >> terrorists use our communications devices. they use our networks. they know how to plan around this. they use skype. they use yahoo! they use google. and they are amongst us and they're trying to ...