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Voice recordings from one of the black boxes of the Germanwings plane that smashed into the Alps show that one of the pilots left the cockpit and was unable to return as the plane went down.
French aviation officials who had worked on the audio recordings confirmed newspaper reports that revealed the crucial details of the plane's final moments.
Quoted the New York Times , a senior military official said evidence from a cockpit voice recorder had revealed audio from the Airbus A320's gradual 11-minute descent into the side of a mountain in the French Alps.
"And then he hits the door stronger and no answer. There is never an answer.
"You can hear he is trying to smash the door down," the investigator added.
The official does not speculate as to why the other pilot didn't open the door or make contact with ground control before the plane crashed on Tuesday.
The report says there was no indication from the audio as to the reason why the pilot left the cockpit. The paper claims the official was speaking on condition of anonymity as the investigation was ongoing.
While officials have now repeated a similar version of events to both the AFP and AP news agencies, Lufthansa said on Thursday that it had received no new information from investigators and could neither confirm nor deny the reports.
The report comes after officials said earlier that they had managed to extract pilots’ voices from the mangled "black box" of the doomed Germanwings Airbus.
They have so far officially been at a loss to explain why the aircraft flew into the mountain in the French Alps, killing all 150 people on board.
It was reported today that among those killed on the flight were three Britons. Other victims included 72 Germans, 35 Spaniards and people from 12 other nationalities.
In pictures: Germanwings Airbus A320 plane crashShow all 66 1 /66In pictures: Germanwings Airbus A320 plane crash In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Flowers are left in front of the monument in homage to the victims of Germanwings Flight 4U 9525 in Le Vernet, southeastern France
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Andreas Lubitz was deemed ‘unsuitable for flight duties’ for a period of time during his training with Lufthansa and was receiving regular treatment for depression, sources have claimed as investigators focus their inquiry on his personal life and background
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash People believed to be relatives of the deceased crew on Germanwings flight 4U9525 comfort each other at a reception centre in Le Vernet, France
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Rescue workers gather with friends and relatives of those killed onboard Germanwings flight 4U9525 at a reception centre in Le Vernet, France
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Flags representing some of the nationalities of the victims are seen as family members and relatives gather near the crash site of an Airbus A320 in the French Alps
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash German and Spain flags symbolizing some of the nationalities of the victims are seen as family members and relatives gather for a ceremony in Le Vernet near the crash site of an Airbus A320 in the French Alps
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Flags symbolizing some of the nationalities of the victims, are seen near the memorial stele in Le Vernet during a ceremony to pay tribute to the victims of an Airbus A320 in the French Alps
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash French gendarmes and investigators make their way through debris from wreckage on the mountainside at the crash site of an Airbus A320, near Seyne-les-Alpes
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash French gendarmes and investigators work amongst the debris of the Airbus A320 at the site of the crash, near Seyne-les-Alpes, French Alps
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash French gendarmes and investigators make their way through the debris of the Airbus A320 at the site of the crash near Seyne-les-Alpes, French Alps
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Wreckage of the Airbus A320 is seen at the site of the crash, near Seyne-les-Alpes, French Alps
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash A body of a victim is evacuated by a French Gendarmerie rescue helicopter from the crash site of an Airbus A320, near Seyne-les-Alpes
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Rescue workers recover bodies of victims from the crash site of an Airbus A320, near Seyne-les-Alpes
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash French military personnel work amongst the debris of the Airbus A320 at the site of the crash, near Seyne-les-Alpes, French Alps
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash A helicopter of the French Gendarmerie flies over the crash site of the Germanwings Airbus A320 that crashed in the French Alps, above the town of Seyne-les-Alpes, southeastern France
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Search and rescue workers make their way through debris at the crash site of the Germanwings Airbus A320 that crashed in the French Alps, above the town of Seyne-les-Alpes, southeastern France
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Flowers and lit candles are placed on the ground in Cologne Bonn airport
Reuters
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Victims’ relatives join carers outside the school gym in Seyne
Getty Images
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Lufthansa CEO Carsten Spohr, left, and Germanwings CEO Thomas Winkelmann arrive for a press conference near the Germanwings headquarters in Cologne, Germany
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Andreas Lubitz, the co-pilot that crashed the Germanwings Airbus A320 in the French Alps
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In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Buses loaded with relatives of victims are escorted after their arrival at Marseille airport, southern France
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Family and relatives of the victims of the Germanwings plane crash in the Alps are taken on bus to the Prat airport from a hotel in Castelldefels in Barcelona, Spain, to take a Lufthansa flight to visit the crash site in Seyne les Alps in France
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash An Airbus plane of German airline Lufthansa carrying onboard relatives of the Germanwings plane crash victims takes off from the Duesseldorf airport in Duesseldorf, western Germany, en route to Marseille
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash A Germanwings employee places flowers in commemoration of the victims of the Germanwings plane crash in the French Alps, at the airport in Duesseldorf, Germany
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Members of German Government Chancellor Angela Merkel, Vice Chancellor and Economy Minister Sigmar Gabriel and Foreign Minister Frank-Walter Steinmeier, from right, hold a minute of silence to commemorate the victims of the Germanwings plane crash in the French Alps at the parliament Bundestag in Berlin, Germany
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Realtives of passengers of the Germanwings airliner that crashed in the French Alps leave the Gran Hotel Rey Don Jaime towards Barcelona El Prat airport where a lufthansa plane will fly to Marseille, in Barcelona, Spain
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Olivier Cousin (R), director of the mountain rescue team, which is responsible for the safety of the emergency workers on site, gives an interview in Seyne Les Alpes, France
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Alpine climbers take off in a police helicopter in Seyne Les Alpes
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash German Chancellor Angela Merkel (L), French President Francois Hollande (C) and Spain's Prime Minister Mariano Rajoy pay respect to victims in front of the mountain in Seyne-les-Alpes, the day after the air crash of a Germanwings Airbus A320
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash A member of the search and rescue personnel stands at the crash site of the Germanwings Airbus A320 in the French Alps
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Search and rescue personnel at the crash site of the Germanwings Airbus A320 in the French Alps
Reuters
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash A sealed container holds black box from the German Airbus operated by Lufthansa's Germanwings budget Airbus A320 crash
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash The voice data recorder of the Germanwings jetliner that crashed in the French Alps
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash The voice data recorder of the Germanwings jetliner that crashed in the French Alps
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Germanwings employees cry as they place flowers and lit candles outside the company headquarters in Cologne Bonn airport
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash A student who knew some of the German students involved in a crashed plane, reacts during a minute of silence in front of the council building in Llinars del Valles, near Barcelona, Spain
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Photograph of victims, flowers and candles stand outside the Joseph-Koenig-Gymnasium high school where pupils had gathered to pay tribute to 16 students and two teachers from the school who were on Germanwings flight 4U9525 that crashed yesterday in southern France on March 25, 2015 in Haltern, Germany
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Pupils gather at the Joseph-Koenig-Gymnasium high school to pay tribute to 16 students and two teachers from the school who were on Germanwings flight 4U9525 that crashed yesterday in southern France in Haltern, Germany
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Students gather in front of the Josef-König secondary school in Haltern am See, western Germany, where some of the Germanwings plane crash victims studied
Getty Images
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash A Lufthansa employee signs in a condolence book in Frankfurt, Germany
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash The flags of (L-R) Aragon, Spain and the European Union are lowered to half-mast at the Regional Assembly of Aragon in Zaragoza, Spain, as a sign of respect for the victims of the German plane crash in the French Alps
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash The German and the European Union flags hang at half mast in memory of the victims of the plane crash in France in front of the Federal Chancellery in Berlin, Germany
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash French President François Hollande with Spain’s King Felipe VI and Queen Letizia pay their respects to the victims of the German plane crash in the French Alps
Reuters
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Debris from the Germanwings Airbus A320 at the crash site in the French Alps above the southeastern town of Seyne
Getty Images
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Search and rescue personnel at the crash site of the Germanwings Airbus A320 in the French Alps
Getty Images
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Wreckage and debris lie on the mountain slopes after the crash of the Germanwings Airbus A320 over the French Alps
EPA
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Staff members of Germanwings and Lufthansa hold a candlelight vigil outside their headquarters in Cologne
Getty Images
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash A photo provided by the French Gendarmerie shows the crash site in the French Alps
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash A rescue helicopter from the French Gendarmerie flies over the French Alps, as day fades into night near to the crash site of the Airbus A320
Reuters
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash A general view of the crash site of a Germanwings Airbus A320 in the French Alps above Seyne-les-Alpes is pictured in this photo provided by the French Gendarmerie
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Family members of people involved in a crashed plane arrives at the Barcelona airport in Spain
AP/Emilio Morenatti
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Rescue helicopters from the French Gendarmerie and the Air Force are seen in front of the French Alps during a rescue operation near to the crash site
Reuters
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash A helicopter of the French National Gendarmerie is seen in Seyne, south-eastern France, near the site where a Germanwings Airbus A320 crashed in the French Alps
ANNE-CHRISTINE POUJOULAT/AFP/Getty Images
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash French emergency services workers (back) and members of the French gendarmerie gather in Seyne, south-eastern France, near the site where a Germanwings Airbus A320 crashed in the French Alps
BORIS HORVAT/AFP/Getty Images
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash An helicopter of civil security services is seen in Seyne, south-eastern France, near the site where a Germanwings Airbus A320 crashed in the French Alps
ANNE-CHRISTINE POUJOULAT/AFP/Getty Images
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Relatives of passangers of the Germanwings plane crashed in French Alps arrive escorted by police officer at Terminal 2 of Barcelona El Prat airport in Barcelona
David Ramos/Getty Images
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Relatives of passangers of the Germanwings plane crashed in French Alps arrive at Terminal 2 of Barcelona El Prat airport in Barcelona, Spain
David Ramos/Getty Images
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Relatives of passengers killed in Germanwings plane crash arrive at the airport in Duesseldorf, Germany
AP/Frank Augstein
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash Police escort a family member of an aircrash victim at Barcelona's El Prat airport
LLUIS GENE/AFP/Getty Images
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash French firefighters prepare to take-off in Digne-les-Bains for the crash site of an Airbus A320, in the French Alps
REUTERS/Jean-Paul Pelissier
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash A family member of a passenger killed in Germanwings plane crash reacts as he arrives at Barcelona's El Prat airport
REUTERS/Albert Gea
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash People arrive at a holding area for friends and relatives of passengers on Germanwings flight 4U9525 from Barcelona to Dusseldorf at Dusseldorf International Airport in Dusseldorf, Germany
Sascha Steinbach/Getty Images
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash People waiting for flight 4U 9525 are lead away by airport staff at the airport in Duesseldorf, Germany
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash A relative (C) of passangers of the Germanwings plane crashed in French Alps arrives at the Terminal 2 of the Barcelona El Prat airport
David Ramos/Getty Images
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash A man who appears to have waited for the missing flight 4U 9525 reacts at the airport in Duesseldorf, Germany
AP/Frank Augstein
In pictures: Germanwings Airbus A320 plane crash Germanwings Airbus A320 plane crash epa04676936 A man looks at a monitor showing a map released on the webpage 'flightradar24 with the exact point where the radar signal of the crashed Airbus A320 aircraft operated by German budget airline 'Germanwings' went missing near Barcelonnette, in the department of Alpes-de-Haute-Provence, in Madrid, Spain
EPA
Reports from the scene stated that the first bodies were being removed last night in a recovery effort hampered by difficult terrain and bad weather.
The development came after French President Francois Hollande, Germany's Angela Merkel and Spain's Mariano Rajoy travelled to the crash site in a remote French Alpine region to pay tribute to the 150 victims.
President Hollande promised that authorities would not rest until the causes of the crash were known, France's BEA air incident investigation bureau said it was still far too early to draw meaningful conclusions on why the plane, operated by the Germanwings budget arm of Lufthansa, went down.
"We have just been able to extract a useable audio data file," BEA director Remi Jouty told a news conference at the agency's headquarters outside Paris.
"We have not yet been able to study and to establish an exact timing for all the sounds and words heard on this file."
Jouty expected the first basic analysis in "a matter of days" but warned this read-out could be subject to errors and that more work would be needed for a full interpretation.
Although he said "words" had been heard on the tape, Jouty would not confirm whether that meant the Airbus A320's pilots were conscious and he gave no details of the recordings.
Interior Minister Bernard Cazeneuve earlier said a terror attack was not the main hypothesis. Jouty said, however, that no theory could be excluded yet.
While stressing it was too early to form a clear picture, he ruled out a mid-air explosion and said the crash scenario did not appear to be linked to depressurisation.
In what seemed an accelerated push to extract as much early information as possible from the cockpit tapes, BEA officials worked late into the evening at their offices.
Additional reporting by AP, Reuters
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