The heads of Lufthansa and Germanwings paid their respects on Wednesday near the crash site of the plane that slammed into the French Alps, following reports that a video has emerged showing the final terrifying seconds in the cabin.
Descriptions of the chilling mobile phone footage in French and German media angered prosecutors probing the March 24 disaster, who called on anyone with video of the accident to hand it over to investigators immediately.
Carsten Spohr and Thomas Winkelmann's visit came at a time of intense scrutiny on Germanwings owner Lufthansa, which has revealed it was aware that the co-pilot suspected of deliberately crashing the airliner, killing all 150 on board, had suffered from severe depression.
Lufthansa's Spohr and Germanwings chief Winkelmann arrived at Seyne-les-Alpes near the crash site aboard a helicopter, later making their way to the village of Le Vernet where they laid a wreath at the foot of a memorial erected for the victims.
There are "no words to describe how terrible this accident is," he said, thanking rescue teams and locals for their support in the aftermath of the disaster and promising continued help for the victims' relatives.
The crash, which caused shock worldwide, continues to make headlines, with French and German media saying they have seen a video purportedly showing the final seconds aboard the doomed airliner, which they said was shot on a mobile phone that somehow survived the crash.
People were heard crying "My God" in several languages, the magazine said.
Paris Match said "metallic banging" could be heard more than three times -- tallying with reports that the pilot tried to smash down the cockpit door with an axe.
Marseille prosecutor Brice Robin, one of the lead investigators into the crash, added that anyone with footage "must hand it over immediately to investigators".
But the Paris Match journalist who wrote about the footage said he did not own the video, and had merely seen it.
"It's a passenger who films from the back of the plane," Frederic Helbert said.
Gathering personal belongings
Meanwhile, authorities were set on Wednesday to start gathering the personal belongings of victims at the remote crash site.
In Berlin on Tuesday, French President Francois Hollande said authorities hoped identification of all 150 passengers would be possible within a week, though investigators have previously said it could take weeks and some may never be identified due to the extent of the devastation.
Some 450 relatives have visited the site so far, a local official said Tuesday.
Lufthansa said $300 million (280 million euros) had been earmarked to cover the damages, while Germanwings will immediately compensate each family with 50,000 euros -- a sum that will not be deducted from any final compensation deal.
Blow to Lufthansa's image
The catastrophe has dealt a heavy blow to the image of Lufthansa, which announced on Tuesday it would cancel celebrations next month to mark its 60th anniversary.
German prosecutors have said Lubitz was diagnosed as suicidal "several years ago", before he became a pilot, but had appeared more stable of late.
Doctors had recently found no sign he intended to hurt himself or others, but he was receiving treatment from neurologists and psychiatrists who had signed him off sick from work a number of times, including on the day of the crash.
Police found torn-up sick notes during a search of his apartment after the crash.
The plane's second black box, which gathered technical data on the flight, has yet to be found.
French investigators said on Tuesday they would now concentrate on "the systemic weaknesses" that might have caused the disaster, including the logic of locking cockpit doors from the inside, which was introduced after the September 11, 2001 terrorist hijackings in the United States.
Several airlines and countries around the world have since ruled that two authorised crew members must be present in the cockpit at all times.
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