Arnaud Desjardin, deputy head of the investigations department of BEA, the French Air Accident Investigation Agency, delivers a speech during a press conference at Le Bourget airport, north of Paris, Sunday, March 13, 2016. Germanwings co-pilot Andreas Lubitz had been treated for depression in the past, and the investigation found that he had consulted dozens of doctors in the weeks before he deliberately crashed a jet into the French Alps on March 24, 2015, killing all 150 people on board. (AP Photo/Christophe Ena)
Arnaud Desjardin, deputy head of the investigations department of BEA, the French Air Accident Investigation Agency, delivers a speech during a press conference at Le Bourget airport, north of Paris, Sunday, March 13, 2016. Germanwings co-pilot Andreas Lubitz had been treated for depression in the past, and the investigation found that he had consulted dozens of doctors in the weeks before he deliberately crashed a jet into the French Alps on March 24, 2015, killing all 150 people on board. (AP Photo/Christophe Ena) Credit: Christophe Ena

LE BOURGET, France — Aviation agencies around the world should draw up new rules requiring medical workers to warn authorities when a pilot’s mental health could threaten public safety, French investigators recommended Sunday after a yearlong probe into the Germanwings plane crash.

The French investigation found that Germanwings co-pilot Andreas Lubitz, who had been treated for depression in the past, had consulted with dozens of doctors in the weeks before he deliberately crashed a jet into the French Alps on March 24, 2015, killing all 150 people on board.

But none of the doctors told authorities of any concerns about Lubitz’s mental health, France’s BEA air accident investigation agency said, including one who referred Lubitz to a psychiatric clinic just two weeks before the crash.

“Experts found that the symptoms (two weeks before the crash) could be compatible with a psychotic episode,” said Arnaud Desjardin, leader of the BEA investigation. This information “was not delivered to Germanwings.”

Because Lubitz didn’t inform anyone of his doctors’ warnings, the BEA said in a statement, “no action could have been taken by the authorities or his employer to prevent him from flying.”

The agency also said Lubitz was using antidepressants at the time of the crash.