PARIS (AP) — French investigators have identified body parts from all 150 people aboard the Germanwings flight that crashed more than a week ago, a prosecutor said Thursday. 
 
 President of the German Aviation Association Klaus-Peter Siegloch addresses a news conference after a meeting with German Minister of Transport Alexander Dobrindt in Berlin, Thursday, April 2, 2015.... (Associated Press) 
 
 Mountain troops, police and gendarme officer listen during a briefing before heading to the crash site, Thursday, April 2, 2015 in Seyne-les-Alpes, France. Investigators believe co-pilot Andreas Lubitz... (Associated Press) 
 
 Soldiers leave after a briefing and before heading to the crash site, Thursday, April 2, 2015 in Seyne-les-Alpes, France. Investigators believe co-pilot Andreas Lubitz intentionally crashed the Germanwings... (Associated Press) 
 
 Flags representing different nations are deployed during an homage ceremony with family members of victims in front of a stele, a stone slab erected as a monument, set up in memory of the victims in... (Associated Press) 
 
 In this photo taken on Tuesday, March 31, 2015 and provided by the French Interior Ministry, French emergency rescue services work among debris of the Germanwings passenger jet at the crash site near... (Associated Press) 
 
 Family members of victims walk between buses for a memorial ceremony in front of a stele, a stone slab erected as a monument, set up in memory of the victims in the area where the Germanwings jetliner... (Associated Press) 
 
 People stand in front of the church St. Sixtus during a memorial service inside, in Haltern, Germany, Wednesday April 1, 2015 to commemorate the victims of a airplane crash. A week ago 150 people died... (Associated Press) 
 
 In this photo taken on Tuesday, March 31, 2015 and provided by the French Interior Ministry shows debris of the Germanwings passenger jet at the crash site near Seyne-les-Alpes, France. The heads of Lufthansa... (Associated Press) 
 
 In this photo taken on Tuesday, March 31, 2015 and provided by the French Interior Ministry, French emergency rescue services work among debris of the Germanwings passenger jet at the crash site near... (Associated Press) 
 
 People stand in front of the church St. Sixtus during a memorial service inside, in Haltern, Germany, Wednesday April 1, 2015 to commemorate the victims of a airplane crash. A week ago 150 people died... (Associated Press) 
 
 German Transport minister, Alexander Dobrindt, left, and the President of the German Aviation Association, Klaus-Peter Siegloch, address the media in Berlin, Thursday, April 2, 2015. Dobrindt met with... (Associated Press) 
 
 Roland Wolff, German Investigator in Chief of Dusseldorf, answers questions from agency TV reporters, in Digne les Bains, French Alps, France, Wednesday, April 1, 2015. The heads of Lufthansa and its... (Associated Press) 
 
 Mountain troop members prepare to leave for the crash site, Thursday, April 2, 2015 in Seyne-les-Alpes, France. Investigators believe co-pilot Andreas Lubitz intentionally crashed the Germanwings A320... (Associated Press) 
 
 Investigators have found and studied 2,854 body parts, Marseille Prosecutor Brice Robin said. 
 
 But he said it will still take a long time for investigators to match the body parts with DNA samples from families of the victims. 
 
 Robin also gave details about the discovery of the second black box. He said it was found by a gendarme buried on the left side of a ravine "already explored several times." 
 
 He described the flight data recorder as "completely blackened" as though it had been burned, but said it was "possibly usable." 
 
 Robin said 40 cellphones had been found at that crash site in a "very, very damaged" condition, without referring to the reports by Paris Match and Bild that footage of the final moments of the crash had been recovered. 
 
 In Germany, prosecutors said the co-pilot of Germanwings Flight 9525 appears to have researched suicide methods and cockpit door security in the days before he crashed the plane into the French Alps, killing everyone aboard. 
 
 Search terms found on a tablet computer at co-pilot Andreas Lubitz's apartment in Duesseldorf provided the first evidence that his actions may have been premeditated. 
 
 Based on information from the cockpit voice recorder, investigators believe Lubitz, 27, locked his captain out of the Airbus A320 cockpit on March 24 and deliberately slammed the plane into a French mountain. 

 Marseille, France (CNN) Initial tests on the flight data recorder recovered from downed Germanwings Flight 9525 show that co-pilot Andreas Lubitz purposely used the controls to speed up the plane's descent, according to the French air accident investigation agency, the BEA. 
 
 The flight data recorder, or "black box," was found Thursday by recovery teams that have spent days since the March 24 crash scouring the mountainside in the French Alps where the plane went down. 
 
 A statement from the BEA on Friday said its teams had immediately begun to investigate its contents. 
 
 "The initial readout shows that the pilot present in the cockpit used the autopilot to put the (airplane) into a descent towards an altitude of 100 (feet) then, on several occasions during the descent, the pilot modified the autopilot setting to increase the speed of the (airplane) in descent," it said. 
 
 "Work is continuing to establish the precise history of the flight." 
 
 Evidence from the plane's cockpit voice recorder, recovered swiftly after the crash, had already led investigators to believe that Lubitz acted deliberately to bring down the plane, killing all 150 people on board. 
 
 And prosecutors in Germany said Thursday that an analysis of a tablet device retrieved from the 27-year-old's apartment in Dusseldorf revealed that he had researched suicide methods and cockpit door security on the Internet. 
 
 The correspondence and search history on the device demonstrated that the co-pilot used it from March 16 to March 23, Dusseldorf prosecutor Christoph Kumpa said. 
 
 The search history was not deleted and also revealed searches concerning medical treatment, the prosecutor said. 
 
 DNA profiles 
 
 Investigators have focused on Lubitz's health as they try to establish his motivation. 
 
 But the missing "black box" was expected to yield important evidence about the plane's final minutes. 
 
 A female police officer digging by hand for clothes in a ravine that been searched previously found the flight data recorder Thursday afternoon about 8 inches (20 centimeters) below the surface, Marseille prosecutor Brice Robin told reporters. 
 
 Usually white with florescent orange, this discovered recorder lived up to its name as a black box because fire had darkened it with ashes. 
 
 In addition, out of more than 2,000 DNA samples collected from the crash site, lab workers have isolated 150 DNA profiles, Robin told reporters. 
 
 "That does not mean we've identified" the crash's 150 victims, Robin said -- noting the recovered DNA still must be compared with DNA submitted by the families of those who died in the crash. 
 
 Authorities have also found 470 personal effects at the site, according to Robin. That number includes 40 cell phones, though all those were badly damaged. Robin cast doubt that any useful information could be retrieved from those phones, given their condition. 
 
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 That view is consistent with French officials' claims Wednesday insisting that two publications, German daily Bild and French Paris Match, were wrong to report that cell phone video showed the harrowing final seconds from on board the flight. 
 
 'Premeditated murder' claim 
 
 Noting he's made a criminal request to German authorities but is for now conducting his own investigation, the French prosecutor said he is tasked with an involuntary homicide investigation. 
 
 But Robin noted that Lubitz made voluntary actions -- such as guiding the plane toward the mountain and reducing its speed to prevent alarms from going off -- and was "alive and conscious" to the very end. 
 
 A European official government official with detailed knowledge of the investigation said that Lubitz's actions amount to "premeditated murder." 
 
 While cautioning that there are still many holes in understanding Lubitz's motivation, the disclosures about his Internet searches show that he planned to do what he was going to do, according to this official. 
 
 Source: Lubitz saw multiple doctors 
 
 It is becoming increasingly clear to investigators that Lubitz was "very afraid" he would lose his license to fly because of his medical issues, a law enforcement source with detailed knowledge of the investigation told CNN on Thursday. 
 
 It's already emerged that Lubitz had battled depression years before he took the controls of Flight 9525 and that he had concealed from his employer recent medical leave notes saying he was unfit for work. 
 
 But the law enforcement source said that after a severe depressive episode in 2009, Lubitz relapsed with severe depression and stress in late 2014. 
 
 In the weeks leading up to the crash, Lubitz was shopping doctors, seeing at least five, perhaps as many as six, the source said, as he kept going from one doctor to the next seeking help, including from a sleep specialist. He was prescribed powerful medication, though it's not clear he was taking it.
– The second black box found yesterday at the site of the Germanwings crash is already offering new details about the event that killed 150 people. The charred flight-data recorder was found embedded 8 inches in the ground by an officer who was digging by hand in an already-searched ravine. Experts at the French air accident investigation agency say the recorder reveals co-pilot Andreas Lubitz sped up the plane's descent, reports CNN. "A first reading shows that this pilot in the cockpit used the autopilot to engage the aircraft down to an altitude of 100 feet, and on several occasions during the descent, the pilot changed the driver setting automatically to increase the speed of the plane descending," the agency says. Experts will continue examining the black box, which is said to hold 500 flight records on things like air speed and altitude, the Los Angeles Times reports. French investigators have also discovered and examined 2,854 body parts and say they belong to all 150 people on the flight, the AP reports. But investigators caution matching the parts to DNA samples will take some time. Meanwhile, a flight magazine column written by Emirates pilot Jan Cocheret two months before the crash is getting a lot of attention as it touches on the same security issues seemingly exploited by Lubitz, the Daily Express reports. Cocheret described how a pilot could easily lock a colleague out of the cockpit and how medical assessors can't always determine a person's mental fitness. "I seriously sometimes wonder who's sitting next to me in the cockpit," he wrote. "I hope I never discover what I would be faced with after visiting the toilet and finding a cockpit door that never opened." (Lubitz's browser search history reveals he researched cockpit door security.)