Industry expert says pilot took Malaysian plane to 43,000ft, causing oxygen to run out, as suicide becomes likely cause of crash

Suicide has become the most likely cause of Malaysia Airlines flight MH370's disappearance, with a senior industry source believing that the plane was deliberately flown to an extreme altitude to knock out the passengers.

Shortly after the last voice communication from the cockpit of the plane on March 8 it was tracked by military radar flying between 43,000 and 45,000 feet.

The source, who wished to remain anonymous, told MailOnline: 'It was tracked flying at this altitude for 23 minutes before descending. Oxygen would have run out in 12 minutes, rendering the passengers unconscious.'

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