sources tells cnn investigators uncovered evidence that files from those hard drives were deleted more recently than previously disclosed date of february 3rd that malaysian officials talked about. we still have a lot of unanswered questions. we don't know when this happened. how many deletions there were and who made those deletions. the fbi didn't receive the hard drive until two days ago. forensic experts as well as outside consultants are in a full tilt dive to uncover what was deleted and how it may be a race. that will be very telling. first piece of evidence investigators are looking at is whether those deletions were done in a routine fashion or whether they were scrubbed clean in a more sophisticated way which is more of a red flag and investigators looking at information such as browser history to put a full profile together of these two pilots but so far important to emphasize there's been nothing to indicate nefarious intent. >> let's talk about transcript