According to the French prosecutor leading the investigation, Germanwings pilot Andreas Lubitz contacted dozens of doctors before intentionally crashing Flight 9525 into the Alps in March.

Lubtiz suffered from depression and had reportedly been treated for suicidal tendencies, though prosecutors didn’t say why he contacted the doctors in the weeks leading to the crash. From the Associated Press:

Brice Robin, the lead prosecutor in the investigation into the disaster, told The Associated Press late Thursday that Lubitz had also reached out to dozens of doctors in the period before the crash.

Robin did not elaborate, or comment on whether the pilot had been seeking help for a particular ailment.

He said he has received information from foreign counterparts and was reviewing it before a meeting with victims’ relatives in Paris next week.

On March 24, investigators say the 27-year-old co-pilot locked his captain out of the cockpit and deliberately flew the Germanwings flight into the French Alps, killing all 150 people on board. He reportedly researched cockpit security and suicide in the days before the crash.

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