What questions do you have about the crash? Post on Twitter with the hashtag #GermanwingsQs. We'll take them to aviation experts and try to get them answered.

• Transponder data shows that the autopilot on Germanwings Flight 9525 was reprogrammed by someone in the cockpit to change the plane's altitude from 38,000 feet to 100 feet, according to Flightradar24, a website that tracks aviation data.

• Police searched Germanwings Flight 9525 co-pilot Andreas Lubitz's apartment in Dusseldorf, Germany, on Thursday, the city's police spokesman said in televised comments. A team of five investigators went "through the apartment looking for clues as to what the co-pilot's motivation might have been, if he did indeed bring the plane down," police spokesman Markus Niesczery said.

Full story:

The co-pilot of Germanwings Flight 9525 purposely crashed the plane into the French Alps, killing all 150 people on board, officials said Thursday.

"We at Lufthansa are speechless that this aircraft has been deliberately crashed by the co-pilot," said Carsten Spohr, CEO of Lufthansa, which owns Germanwings.

JUST WATCHED FBI assisting in crash investigation Replay More Videos ... MUST WATCH FBI assisting in crash investigation 01:51

Marseille prosecutor Brice Robin said the co-pilot, 27-year-old German national Andreas Lubitz , apparently "wanted to destroy the aircraft."

It's unknown whether Lubitz planned his actions, Robin said. But he "took advantage" of a moment in which the pilot left the cockpit and "activated the descent," which can only be done deliberately.

Andreas Lubitz

New details released Thursday appeared to support the startling revelation that someone set the plane on a crash course.

Transponder data shows that the autopilot was reprogrammed during the flight by someone inside the cockpit to change the plane's altitude from 38,000 feet to 100 feet, according to Flightradar24, a website that tracks aviation data.

The plane's cockpit audio recorder captured horrific sounds. The captain, somehow locked out of the cockpit, can be heard banging on the door, Robin said.

And screaming can be heard on the audio recording for the final few minutes of the flight.

For those on board when the plane plunged into the mountains, Robin said, death was instantaneous.

No clues about why co-pilot would crash plane

Police searched Lubitz's apartment in Dusseldorf on Thursday, looking for clues about his possible motive.

A search is underway for the plane's second "black box," the flight data recorder, which could shed more light on the plane's final minutes.

And the French government has asked the FBI to help investigate the crash, a law enforcement official said.

Investigators so far say they're baffled about why Lubitz would have crashed the plane

Lufthansa does "not have any clues," Spohr said.

The picture of the plane's final minutes comes largely from what was discovered in the mangled cockpit voice recorder.

JUST WATCHED Lufthansa CEO: Speechless that co-pilot crashed plane Replay More Videos ... MUST WATCH Lufthansa CEO: Speechless that co-pilot crashed plane 01:08

The pilot and co-pilot had normal exchanges during the beginning of the flight, Robin said. When the pilot stepped out to go to the bathroom, he asked Lubitz to take over.

It's unclear whether the pilot entered a code to try to get back into the cockpit when he returned, or whether Lubitz "put the lever on lock," which would have prevented the code from working, Spohr said.

The most plausible explanation of what happened next is that Lubitz, "through deliberate abstention, refused to open the cabin door ... to the chief pilot, and used the button" to cause the plane to lose altitude, Robin said.

The disaster is not being described as a "terrorist attack," and the killing of 150 people would generally not be described as a "suicide" either, Robin said. Spohr agreed: "If a person kills himself and also 149 other people, another word should be used -- not suicide," he said.

Lubitz was not known to be on any terrorism list, and his religion was not immediately known, Robin said.

Lufthansa has no standard psychological testing after hiring

He had been with Germanwings since September 2013 and had completed 630 hours of flight time, the company said. Lubitz had trained at the Lufthansa flight center in Bremen, Germany.

He only had about 100 hours of experience on the type of aircraft he was flying, but he had all the necessary certifications and qualifications to pilot the aircraft alone, the prosecutor said.

He had passed medical tests, Spohr said . The audio recording showed his breathing to be steady, with no sign that he had a heart attack or other medical issue.

Lufthansa does not have standard psychological testing for pilots once they are hired, Spohr said. The company considers an applicant's psychological state when hiring, he said.

The co-pilot was "fully qualified to pilot the aircraft on his own," Robin said.

A man in Montabaur, Germany, who belonged to the same flight club as Lubitz, said he couldn't believe it. "The way I know Andreas, this is inconceivable," Peter Ruecker said.

Village opens homes to victims' loved ones

Relatives and friends of the victims traveled on special Lufthansa flights to an area near the site where their loved ones perished.

Seyne-les-Alpes, a nearby town, is serving as a staging post. Mayor Francis Hermitte predicted that 200 to 300 people would come to the area Thursday.

Most are not expected to stay overnight, he said. But in case they do, he said, local residents have offered accommodations for them.

Lufthansa is providing "financial support" to relatives of the victims, Spohr said. He declined to go into details.

The families of the two pilots are also in France, Robin said, but they are not in the same place as the passengers' relatives.

The bodies of the crash victims will not be released to family members until all DNA identification work has been done -- a process likely to last several weeks, he said.

While some human remains have been recovered, many have not. The task is treacherous for search crews working on steep slopes in icy weather. Workers were dropped by helicopters and tied together for safety.

The mountainous terrain where the Germanwings jet went down is difficult to access.

Victims from 18 countries

The doomed flight was traveling from Barcelona, Spain, to Dusseldorf, Germany, when it crashed Tuesday.

Germanwings said the plane reached its cruising altitude of 38,000 feet, and then dropped for about eight minutes.

The plane lost contact with French radar at a height of about 6,000 feet. Then it crashed.

The 144 passengers and six crew members came from 18 countries . About half were from Germany, and 35 were from Spain.