Associated Press

SEYNE-LES-ALPES, France (AP) — The heads of Lufthansa and its low-cost airline Germanwings are visiting the site of the crash that killed 150 people amid mounting questions about the co-pilot and how much his employers knew about his mental health.

Lufthansa CEO Carsten Spohr and Germanwings CEO Thomas Winkelmann touched down Wednesday by helicopter in Seyne-les-Alpes, near the ravine where the A320 jet shattered into thousands of pieces March 24.

Investigators believe co-pilot Andreas Lubitz intentionally crashed the plane, and are trying to determine why.

FILE - In this  Thursday, March 26, 2015 file photo, rescue workers work at debris of the Germanwings jet at the crash site near Seyne-les-Alpes, France. Inv...

FILE – In this Thursday, March 26, 2015 file photo, rescue workers work at debris of the Germanwings jet at the crash site near Seyne-les-Alpes, France. Investigators recovering remains from all 150 people aboard a German passenger jet that crashed into the Alps have accelerated their timeframe for identifying and matching their DNA _ whether that be from a body part or only a shred of skin. (AP Photo/Laurent Cipriani, File)

Lufthansa said Tuesday that it knew he had suffered from an episode of “severe depression” before he finished his flight training at the German airline, but that he has passed all his medical checks since.

German prosecutors say Lubitz’s medical records from before he received his pilot’s license referred to “suicidal tendencies,” but visits to doctors since then showed no record of any suicidal tendencies or aggression against others.

The revelations intensify questions about how much Lufthansa and its insurers will pay in damages for the passengers who died — and about how thoroughly the aviation industry and government regulators screen pilots for psychological problems.

At the crash site Wednesday, authorities said they have finished collecting human remains from the site.

Investigators “will continue looking for bodies, but at the crash site there are no longer any visible remains,” said Lt. Col. Jean-Marc Menichini.

Lt. Luc Poussel said all that’s left are “belongings and pieces of metal.”

Officials at France’s national criminal laboratory near Paris say it will take a few months for the painstaking identification process to be complete and for the remains to be returned to the families.

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