• Debris from an Airbus A320 is seen in the mountains, near Seyne-les-Alpes

Debris from an Airbus A320 is seen in the mountains, near Seyne-les-Alpes (Photo : REUTERS via Reuters TV/Pool)

Officials are still trying to find why the jet which had 150 people on board crashed into the mountains when the sky was relatively clear. Evidence from the cockpit's voice recorder proves that one pilot had gone out of the cockpit and could not re-enter the cockpit.

A French military official who is part of the investigation told The New York Times that a smooth conversation took between the pilots during the early part of the flight from Barcelona, Spain, to Düsseldorf, Germany. Then the audio indicated that one of the pilots left the cockpit and could not re-enter.

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There is evidence that the pilot outside is knocking lightly on the door and receives no response, he then hits the door harder but receives no answer. He also tries to smash the door down to enter the cockpit, according to The Guardian.

The data from the voice recorder seems has deepened the mystery surrounding the crash and provides no indication of the condition or activity of the pilot who remained in the cockpit. The descent happened with a span of 10 minutes, though it was alarming but still gradual enough to indicate that the twin-engine Airbus A320 had received not any damage. There was no communication from the cockpit to air traffic controllers or any other signal for distress or emergency sent during the duration of the decent.

The impact of the crash was such that it left the whole aircraft pulverized leading to the death of 150 people onboard that included 144 passengers and 6 members of the crew. The mystery of the crash is being investigated by the French authorities and very little has been made public.