On Friday, German police searched the two homes where the co-pilot stayed when not flying: an apartment he kept in Dusseldorf, and his parents' home in the small German town of Montabour.
Authorities Search Home of Germanwings Co-Pilot Andreas Lubitz

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Investigators carry boxes from the apartment of Germanwings co-pilot Andreas Lubitz, in Dusseldorf, Germany, March 26, 2015.

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A police car waits in front of the family house of Andreas Lubitz, co-pilot of the Germanwings plane that crashed in the Alps, in Montabaur, Germany, March 27, 2015.

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A police officer walks near the apartment believed to belong to Germanwings co-pilot Andreas Lubitz, in Dusseldorf, March 27, 2015.

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A wreath of flowers is left for the Spanish victims of the Germanwings air plane disaster at the memorial site for the victims, in the village of Le Vernet, in the French Alps, March 27, 2015.