Returning today from a meeting with counterparts in Germany, judicial police investigator Jean-Pierre Michel told The Associated Press that authorities want to find out "what could have destabilized Andreas Lubitz, or driven him to such an act."
Lubitz was the co-pilot of Germanwings Flight 9525, which slammed into a mountain near Le Vernet, France, last week en route from Barcelona, Spain, to Duesseldorf, Germany.
Germanwings chief operating officer Oliver Wagner was meeting with relatives of the victims Monday in the southeastern French city of Marseille.