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But the French investigation reported it was instead likely the fire started in an oxygen mask storage box within the cockpit.

After Monday's episodes, the Pope had begun using an oxygen mask and ventilator to assist his breathing.

The 88-year-old pontiff has resumed the use of an oxygen mask and ventilator to assist his breathing, but remains "alert, focused and cooperative", the Vatican said.

Ms Wiprud and the captain hurriedly put on oxygen masks, then worked together with calm urgency to bring the damaged aircraft to the ground.

A video filmed in flight by a passenger showed oxygen masks hanging from the ceiling.