A French prosecutor has formally opened a criminal inquiry into the Germanwings plane crash in March that killed 150 people, to investigate whether mistakes were made in monitoring the psychological health of the co-pilot.
A preliminary report into the crash of the A320 in the French Alps found co-pilot Andreas Lubitz locked the captain out of the cockpit and deliberately steered the plane into a mountain.
Marseille Prosecutor Brice Robin said at a news conference in Paris the investigation will be led by a panel of three judges tasked with determining if mistakes were made in analysing the mental state of Mr Lubitz.
Mr Robin said the Germanwings co-pilot saw 41 doctors in five years, seven of them in the month before the crash.
Prosecutors have found evidence that Mr Lubitz, who had suffered from severe depression, had researched suicide methods and concealed an illness from his employer.
This prompted airline industry executives to review pilot screening and licensing.
Last month, a preliminary report confirmed a growing picture of painstaking preparations carried out by Mr Lubitz before the crash.
The European Commission has asked the European Aviation Safety Agency to assess the report and will then decide whether to update aviation safety rules.
The French prosecutor said German investigators had confirmed that Mr Lubitz had searched online for drugs, such as diazepam, for ways to kill himself and for sight problems.
Today, German newspaper Sueddeutsche Zeitung and broadcasters NDR and WDR cited an analysis of a computer found in Mr Lubitz's Duesseldorf apartment showing he had searched the internet for ways to buy potassium cyanide, Valium and lethal drug cocktails in March.
The day before the crash, Mr Lubitz had researched living wills, which detail a person's wishes related to medical treatment that extends life, on the website of the Hamburg Medical Chamber, the media reports said.
They said this was likely out of fear that his suicide attempt could fail.
