FRANCE-GERMANY-SPAIN-AVIATION-ACCIDENT

French gendarmes and members of the Bureau of Enquiry and Analysis (BEA) return to their base after a day of work at the site of the Germanwings crash near Seyne-les-Alpes, in the French Alps, on March 31, 2015. The co-pilot believed to have deliberately crashed a Germanwings plane into the French Alps was classified as suicidal "several years ago" but had appeared more stable of late, German prosecutors said. As investigators in both countries tried to zero in on a potential motive, it emerged that that the first officer, Andreas Lubitz, was receiving treatment from neurologists and psychiatrists who had signed him off sick from work a number of times. AFP PHOTO / JEAN-PERRE CLATOT (Photo credit should read JEAN-PIERRE CLATOT/AFP via Getty Images)