The prosecutor has confirmed the Co-pilot a German national deliberately crashed his plane into the Alps.
Once the pilot left the cockpit to use the toilet the co-pilot activated the descent button and refused to open the cockpit door to the pilot.
The pilot attempted in vain to force entry back into the cockpit, and attempted to bang on the door to re-gain entry.
The Co-Pilot has been named as Andreas Lubitz, 28 and he was alive until the final impact.
The Airbus 320 which was travelling from Barcelona to Duesseldorf hit a mountain killing all 144 passengers and six crew members.
The pilot attempted for eight-minutes to gain entry in to the cockpit. .
The prosecutor Mr Robin “We hear the pilot ask the co-pilot to take control of the plane and we hear at the same time the sound of a seat moving backwards and the sound of a door closing,”
“At that moment, the co-pilot is controlling the plane by himself. While he is alone, the co-pilot presses the buttons of the flight monitoring system to put into action the descent of the aeroplane.
“This action on the altitude controls can only be deliberate.”
“The most plausible interpretation is that the co-pilot through a voluntary act had refused to open the cabin door to let the captain in. He pushed the button to trigger the aircraft to lose altitude. He operated this button for a reason we don’t know yet, but it appears that the reason was to destroy this plane.”
Air traffic controllers became aware of a situation and began making repeated attempts with the aircraft.