It has emerged that one of the pilots on board the German Wings airbus was locked out of the cockpit. Here we examine how this could have happened and why safety procedures seem to have failed.
The co-pilot actively blocked the pilot's reaccess to the cockpit repeatedly by depressing a lever to block the keypad the pilot would use if needed.
Well if that is the case, then obviously he committed mass murder. I guess now they will look into his history, if he had mental issues etc.