Although no definitive cause of engine failure for this second attempt was found, two possibilities were put forward.

A definitive cause of the blaze was not determined, but was widely believed to have been arson.

With the absence of any proof, the inquiry could not attribute any outright blame or definitive cause for the disaster.

The definitive cause of the accident has never been determined.

Initial investigation established no definitive cause for the crash, due to the fireball produced on impact.