Co-Pilot Lubitz, 28 |
He intentionally started a descent while the pilot was locked out.
Mr Robin said there was "absolute silence in the cockpit" as the pilot fought to re-enter it.
Meanwhile,
the head of Lufthansa, the German carrier that owns Germanwings, said
the pilot had undergone intensive training and "was 100% fit to fly
without any caveats".
"We have no findings at all about what motivated the pilot to do this terrible deed," Carsten Spohr said.
Mr
Spohr said Mr Lubitz's training had been interrupted briefly six years
ago but was resumed after "the suitability of the candidate was
re-established".
Mr Robin said air traffic controllers made repeated attempts to contact the aircraft, but to no avail.
Passengers could be heard screaming just before the crash, he added.
Mr Lubitz, 28, was alive until the final impact, the prosecutor said. The
Airbus 320 from Barcelona to Duesseldorf hit a mountain, killing all
144 passengers and six crew, after an eight-minute descent.
"We
hear the pilot ask the co-pilot to take control of the plane and we hear
at the same time the sound of a seat moving backwards and the sound of a
door closing," Mr Robin told reporters.
He said the pilot had probably gone to the toilet.
"At
that moment, the co-pilot is controlling the plane by himself. While he
is alone, the co-pilot presses the buttons of the flight monitoring
system to put into action the descent of the aeroplane.
"This action on the altitude controls can only be deliberate."
He
added: "The most plausible interpretation is that the co-pilot through
a voluntary act had refused to open the cabin door to let the captain
in. He pushed the button to trigger the aircraft to lose altitude. He
operated this button for a reason we don't know yet, but it appears that
the reason was to destroy this plane."
He said the co-pilot was "not known by us" to have any links to extremism or terrorism.
But he said German authorities were expected to give further information on his background and private life later. Passengers
were not aware of the impending crash "until the very last moment" when
screams could be heard, Mr Robin said, adding that they died instantly.
Meanwhile, relatives and friends of the victims are due to visit the area of the crash.
Lufthansa,
which owns Germanwings, arranged two special flights for families and
friends on Thursday - one from Barcelona and one from Duesseldorf - to
Marseille, and both groups will travel on by road. Separately, some
relatives who did not want to fly are travelling by bus from Barcelona.
The second "black box" - that records flight data - has still not been found.
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