Mystery surrounds what brought down Boeing 737 in Iran

Investigators have examined the wreckage from the Ukrainian 737 plane that crashed and killed all 176 on board soon after takeoff from Tehran.
2:15 | 01/09/20

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Transcript for Mystery surrounds what brought down Boeing 737 in Iran
It could be razor thin. That major story out of Iran. New clues on the final moments before the plane went down killing all 176 people on board. David Kerley joins us now with the latest on that investigation. Good morning, David. Reporter: Good morning, Cecilia. The Iranians have issued their first report and suggesting that the jetliner actually was trying to turn around. That's not what the data we have shows. It shows a straight line and then a sudden end to data. This morning, investigators around the world are examining these pictures and this video looking for clues in the wreckage as to what caused that Ukrainian 737 to crash soon after takeoff from Tehran. The 176 on board all killed. Less than four hours after Iran had fired that barrage of missiles at American targets raising questions whether Iran's anti-aircraft system may have shot down this jetliner, something Iran's armed forces Right now we don't have enough data to go one way or the other. Is a shootdown possible, yes. Can I come up with mechanical failures that are possible, yes. Right now we just don't have the data. Reporter: The Ukrainian jet was allowed to take off an hour late just after 6:00 in the morning. Its takeoff appeared normal heading west gaining altitude but two minutes into the flight, less than 5,000 feet above the ground it disappears suddenly from radar. Just ten miles from the airport its burning wreckage knowed in the early morning darkness. Some believe one clue may be in these pictures of the fuselage, a hole blown from the outside in. Could that be from missile shrapnel? That's what was found on mh-17 shot down over Ukraine. The fact that something happened about three seconds before the actual crash that may have been the structure of the airplane falling apart. That's not explicable with an engine. Reporter: Now, already the Iranians said they won't share the findings with Boeing or American investigators but have invited other parties to be part of that investigation, so there is a chance those other parties including the Ukrainians may share the data at some point and that will tell us what actually happened to 24 aircraft, Michael. A lot of questions to be answered. Thank you so much. To Australia where

This transcript has been automatically generated and may not be 100% accurate.

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