'Significant discovery' at Alps pilot's home
27 March 2015 Last updated at 14:14 GMT
Details have emerged about the mental health of Andreas Lubitz.
He apparently flew his airliner into a mountainside in the French Alps killing all 150 people on board.
German prosecutors say medical documents have been found at his home suggesting he had an existing illness and recommending "appropriate medical treatment".
Anna Holligan reports.