According to German newspaper Die Welt, authorities found clear signs of a "serious psychosomatic illness" when searching the home of Germanwings co-pilot Andreas Lubitz.

Quoting an unnamed senior investigator, Die Welt said that Lubitz appears to have suffered from severe depression and "strong subjective burnout syndrome," receiving treatment from "several neurologists and psychiatrists" before this week's deadly crash.

The new report follows similar stories from The New York Times and The Wall Street Journal. Also citing unnamed officials, those papers reported that Lubitz was being treated for depression with prescription drugs (a condition he concealed from his employer) and sought treatment for a potentially psychosomatic vision problem.

On Sunday, The Washington Post reported that handwritten documents found in Lubitz' apartment revealed the pilot was experiencing "deep stress" over his eye issues, believing they threatened his future in his dream career.

According to the Wall Street Journal, investigators found a note written by Lubitz' neuropsychologist excusing him from work for several days, including the day of the crash.

[Image via Getty Images]