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Publicly, malaysian officials did say all the radar data is central to their investigation. >> the manner of the air traffic control at the time of the aircraft make an air turn back is one of the very important criteria for the investigators to look at. >> reporter: in a background briefing, malaysian investigators told cnn that they believed flight mh-370, whoever was flying it had a thorough knowledge of the aircraft. and was a criminal act by one of the two pilots or someone else on board. >> nick, why do investigators there continue to believe that this was a criminal act? >> reporter: it...

Did say all the radar data is central to their investigation. >> the manner of the air traffic control at the time of the aircraft make an air turn back is one of the very important criteria for the investigators to look at. >> reporter: in a background briefing, malaysian investigators told cnn that they believed flight mh-370, whoever was flying it had a thorough knowledge of the aircraft. and was a criminal act by one of the two pilots or someone else on board. >> nick, why do investigators there continue to believe that this was a criminal act? >> reporter: it's based on the flight path, i...

Google or anything else on the internet, i cannot confirm or discount, i can only base on what i've informed you in my pieces. i investigation officials insist privately this new map is not theirs, that it doesn't match malaysian radar readings. despite refusing to comment publicly, malaysian officials did say all the radar tae a is central to their investigation. >> the manner of the air traffic control at the time of the aircraft make an air turn back is one of the very important criteria for the investigationors to look at. >> reporter: malaysian investigators say they believe mh-370 was "f...

Internet, i cannot confirm or discount. i can only base on what i've informed you in my pieces. >> reporter: investigation officials insist privately this new map is not theirs, that it doesn't match malaysian radar readings. despite refusing to comment publicly, malaysian officials did say all the radar data is central to their investigation. >> the manner of the air traffic control at the time of the aircraft make an air turn back is one of the very important criteria for investigators to look at. >> reporter: in a background meeting given to cnn, malaysian investigators say they believe mh-...

More than a dozen countries involved, of course including the united states, australia, new zealand, all the neighboring countries of course around malaysia. but what is instead of narrowing down the search, they are expanding it each and every day as time goes on further and further. obviously there has been a long agonizing wait for the families and friends of those on board flight mh 370. they want to locate exactly where this plane is. as time goes on, they failed to. we started the search to the east of malaysia where we believe the plane was heading on the course as usual for beijing. th...