Media playback is unsupported on your device Media caption Co-pilot Andreas Lubitz, seen here on his Facebook profile, controlled the plane's descent, Marseille prosecutor Brice Robin said 
 
 The man suspected of deliberately crashing a Germanwings A320 plane in the French Alps required treatment for depression, German media say. 
 
 Regular assessments were recommended in Andreas Lubitz's official notes after a serious episode some years ago. 
 
 The Barcelona-Duesseldorf plane crashed on Tuesday, killing 150 people. 
 
 Data from the plane's voice recorder suggest Mr Lubitz purposely started a descent as the pilot was locked out of the cockpit. 
 
 Several airlines have now pledged to change their rules to ensure at least two crew members are present in the cockpit at all times. 
 
 Police have searched two German properties used by Mr Lubitz, taking away boxes and a computer. 
 
 'Heavily depressive' 
 
 When Mr Lubitz finished training in 2009, he was diagnosed with a serious depressive episode and went on to receive treatment for a year and a half, the German news site Bild reports. 
 
 Internal documents quoted by Bild and German broadcaster ARD say a note on Mr Lubitz's aviation authority file recommended regular psychological assessment. 
 
 Andreas Lubitz: Germanwings co-pilot under scrutiny 
 
 Started training in 2008, at Bremen and Arizona. Training was interrupted for some months - but he later passed all tests and was deemed fit to fly 
 
 Working as co-pilot, or first officer, since 2013. Appeared pleased with his job 
 
 Lived in town of Montabaur, near Frankfurt, reportedly with his parents. Kept a flat in Duesseldorf and had many friends 
 
 Facebook profile suggests the active lifestyle of a keen runner, with an interest in pop music 
 
 Who was Andreas Lubitz? 
 
 Mr Lubitz's employers have confirmed that his training was interrupted for several months six years ago. 
 
 But they have not said why. Carsten Spohr - the head of Lufthansa, the German carrier that owns Germanwings - said on Thursday that Mr Lubitz was only able to resume training after his suitability was "re-established". 
 
 "He passed all the subsequent tests and checks with flying colours," Mr Spohr was quoted as saying. 
 
 German media are also reporting that investigators have found evidence of mental health problems at Mr Lubitz's Duesseldorf flat. 
 
 Earlier, another media report quoted a police spokesman as saying "a very significant clue as to what has happened" had been found during the search of the house the 27-year-old shared with his parents in Montabaur, north of Frankfurt, without specifying what. 
 
 Police said the discovery was not a suicide note. 
 
 French Prime Minister Manual Valls said the investigation was ongoing, but that "everything is pointing to a criminal, crazy, suicidal action that we cannot comprehend". 
 
 He said investigators and Lufthansa would have to "shed light on the career and profile of this pilot". 
 
 Image copyright Reuters Image caption Mr Lubitz is said to have been an enthusiastic runner and is here pictured running a half-marathon in September 2009 
 
 Image copyright AP Image caption Police have been coming and going at the home of Mr Lubitz's parents north of Frankfurt, which is also the focus of a media spotlight 
 
 Image copyright AFP Image caption Families of the crash victims visited Seyne-les-Alpes, a town close to the crash site 
 
 Image copyright Getty Images Image caption In the hamlet of Vernet, a "viewing tent" was set up where families could look in the direction of the crash site. Families laid flowers and photographs in memory of those lost. 
 
 Police continued to come and go at the Montabaur house throughout Thursday morning, reports the BBC's Anna Holligan who is outside. 
 
 She says there are concerns for Mr Lubitz's parents, who have suffered not just one trauma - their son dying in a crash - but the subsequent shock of finding out he may have been responsible for the tragedy. 
 
 Axe 
 
 Based on data from the recovered "black box" voice recorder, Marseille prosecutor Brice Robin said on Thursday that Mr Lubitz appeared to want to "destroy the plane". 
 
 The evidence suggested the pilot had left the cockpit, probably to go to the toilet, during which the door was barred. He fought unsuccessfully to get back in, he said. 
 
 Bild quotes security sources as saying that the pilot used an axe to try to break down the door. 
 
 A Germanwings spokesperson would only confirm that an emergency axe is part of the equipment on board an A320. 
 
 Media playback is unsupported on your device Media caption Rescuer Jean Sebastien Beaud describes the plane crash scene as "surreal" 
 
 What happened in the final half hour? 
 
 Family members of some of the 150 passengers and crew who died have visited Seyne-les-Alpes, near the crash site, reported Reuters news agency. 
 
 They were accompanied by psychologists, paramedics and Red Cross workers, and a youth centre in the town was set up to receive them, it said. 
 
 Families are providing DNA samples to allow for identification of victims' remains. 
 
 Meanwhile, investigators continue to comb the crash site for body parts, debris and the second "black box", which records flight data and still has not been found three days after the plane crashed. 
 
 Flight club 
 
 Members of the Westerwald flight club, where the co-pilot was a member, expressed their shock at the revelations about Mr Lubitz's mental history. 
 
 Media playback is unsupported on your device Media caption Members of the flight club where Andreas Lubitz was a member have been talking about his personality 
 
 "Andreas was a very nice young man, who did his training here. He was part of the club," Peter Reucker said. 
 
 "[He was] funny, sometimes a bit quiet, but apart from that a young man like many others that we have here. He integrated well. 
 
 "I'm absolutely speechless. I have no explanation for this," Mr Reucker added. 
 
 Crash site close-ups 
 
 Other incidents thought to be caused by deliberate pilot action 
 
 29 November 2013: A flight between Mozambique and Angola crashed in Namibia, killing 33 people. Initial investigation results suggested the accident was deliberately carried out by the captain shortly after the first officer (also known as the co-pilot) had left the flight deck. 
 
 A flight between Mozambique and Angola crashed in Namibia, killing 33 people. Initial investigation results suggested the accident was deliberately carried out by the captain shortly after the first officer (also known as the co-pilot) had left the flight deck. 31 October 1999: An EgyptAir Boeing 767 went into a rapid descent 30 minutes after taking off from New York, killing 217 people. An investigation suggested that the crash was caused deliberately by the relief first officer but the evidence was not conclusive. 
 
 An EgyptAir Boeing 767 went into a rapid descent 30 minutes after taking off from New York, killing 217 people. An investigation suggested that the crash was caused deliberately by the relief first officer but the evidence was not conclusive. 19 December 1997: More than 100 people were killed when a Boeing 737 travelling from Indonesia to Singapore crashed. The pilot - suffering from "multiple work-related difficulties" - was suspected of switching off the flight recorders and intentionally putting the plane into a dive. 
 
 Source: Aviation Safety Network ||||| Dusseldorf, Germany (CNN) Years before he was at the controls of a Germanwings plane that plunged into the French Alps, Andreas Lubitz told the airline he worked for that he'd had a bout with depression. 
 
 Lubitz, the co-pilot of Germanwings Flight 9525 who authorities accuse of deliberately crashing the plane, told his Lufthansa flight training school in 2009 that he had a "previous episode of severe depression," the airline said Tuesday. 
 
 Email correspondence between Lubitz and the school discovered in an internal investigation, Lufthansa said, included medical documents he submitted in connection with resuming his flight training. 
 
 The announcement indicates that Lufthansa, the parent company of Germanwings, knew of Lubitz's battle with depression, allowed him to continue training and ultimately put him in the cockpit. 
 
 Lufthansa, whose CEO previously said Lubitz was 100% fit to fly, described its statement Tuesday as a "swift and seamless clarification" and said it was sharing the information and documents -- including training and medical records -- with public prosecutors. 
 
 It's a development that will likely be a part of the crash investigation, but it's only one piece of the puzzle, CNN aviation correspondent Richard Quest said. 
 
 "We need to know what happened after he returned in 2009 and finished his training, because that tells us whether there was the correct procedure and process," he said. 
 
 A Lufthansa spokesperson told CNN on Tuesday that Lubitz had a valid medical certificate, had passed all his examinations and "held all the licenses required." 
 
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 Possible motive: Fear of losing license 
 
 The details about Lubitz's correspondence with the flight school during his training were among several developments as investigators continued to delve into what caused the crash and Lubitz's possible motive for downing the jet. 
 
 Earlier, a spokesman for the prosecutor's office in Dusseldorf said Lubitz suffered from suicidal tendencies at some point before his aviation career. 
 
 Medical records reveal that Lubitz was suicidal at one time and underwent psychotherapy before he got his pilot's license, prosecutor's spokesman Christoph Kumpa said. 
 
 Kumpa emphasized there's no evidence suggesting Lubitz was suicidal or acting aggressively before the crash. 
 
 Investigators are looking into whether Lubitz feared his medical condition would cause him to lose his pilot's license, a European government official briefed on the investigation into last week's crash told CNN on Tuesday. 
 
 While flying was "a big part of his life," the source said, it's only one theory being considered. 
 
 Another source, a law enforcement official briefed on the investigation, also told CNN that authorities believe the primary motive for Lubitz to bring down the plane was that he feared he would not be allowed to fly because of his medical problems. 
 
 Lubitz's girlfriend told investigators he had seen an eye doctor and a neuropsychologist, both of whom deemed him unfit to work recently and concluded he had psychological issues, the European government official said. 
 
 Lubitz told the neuropsychologist that he was too stressed with work, the official said. 
 
 But no matter what details emerge about his previous mental health struggles, there's more to the story, said Brian Russell, a forensic psychologist. 
 
 "Psychology can explain why somebody would turn rage inward on themselves about the fact that maybe they weren't going to keep doing their job and they're upset about that and so they're suicidal," he said. "But there is no mental illness that explains why somebody then feels entitled to also take that rage and turn it outward on 149 other people who had nothing to do with the person's problems." 
 
 Video of flight's final seconds? 
 
 Reports say a cell phone video shows the nightmarish final seconds of Germanwings Flight 9525, but a police spokesman said the accounts were "completely wrong." 
 
 French magazine Paris Match and German newspaper Bild reported that a video recovered from a phone at the wreckage site showed the inside of the plane moments before it crashed. 
 
 "One can hear cries of 'My God' in several languages," Paris Match reported . "Metallic banging can also be heard more than three times, perhaps of the pilot trying to open the cockpit door with a heavy object. Towards the end, after a heavy shake, stronger than the others, the screaming intensifies. Then nothing." 
 
 The two publications described the video, but did not post it on their websites. The publications reported that they watched the video, which was found by a source close to the investigation. 
 
 "It is a very disturbing scene," said Julian Reichelt, editor-in-chief of Bild online. 
 
 An official with France's accident investigation agency, the BEA, said the agency is not aware of any such video. 
 
 Lt. Col. Jean-Marc Menichini, a French Gendarmerie spokesman in charge of communications on rescue efforts around the Germanwings crash site, told CNN that the reports were "completely wrong" and "unwarranted." Cell phones have been collected at the site, he said, but that they "hadn't been exploited yet." 
 
 Menichini said he believed the cell phones would need to be sent to the Criminal Research Institute in Rosny sous-Bois, near Paris, in order to be analyzed by specialized technicians working hand-in-hand with investigators. But none of the cell phones found so far have been sent to the institute, Menichini said. 
 
 Asked whether staff involved in the search could have leaked a memory card to the media, Menichini answered with a categorical "no." 
 
 Reichelt told "Erin Burnett: Outfront" that he had watched the video and stood by the report, saying Bild and Paris Match are "very confident" that the clip is real. 
 
 He noted that investigators only revealed they'd recovered cell phones from the crash site after Bild and Paris Match published their reports. 
 
 "That is something we did not know before. ... Overall we can say many things of the investigation weren't revealed by the investigation at the beginning," he said. 
 
 Recovery efforts continue 
 
 While investigators search for clues to Lubitz's motivation, recovery workers continue the grim task of searching for the remains of those killed in the March 24 crash. 
 
 The remains of at least 78 people on board the plane have been identified so far using DNA analysis. 
 
 Naffrechoux warned Monday that "it may not be possible to find the human remains of all the 150 passengers, as some of them may have been pulverized by the crash." 
 
 But French President Francois Hollande, speaking alongside German Chancellor Angela Merkel in Berlin, was more positive, saying that it should be possible to identify all the victims by the end of the week. 
 
 Photos: Germanwings plane crashes in France Photos: Germanwings plane crashes in France A recovery crew works among debris of Germanwings Flight 9525 at the crash site near Seyne-les-Alpes, France, on Friday, April 3. The crash killed all 150 people aboard and has raised questions about the co-pilot's mental state. Hide Caption 1 of 26 Photos: Germanwings plane crashes in France French Gen. David Galtier holds up a picture of the second black box from Germanwings 9525 during a news conference in Marseille, France, on Thursday, April 2. The flight data recorder shows that co-pilot Andreas Lubitz purposely used the controls to speed up the plane's descent, investigators said. Hide Caption 2 of 26 Photos: Germanwings plane crashes in France Rescue workers recover debris from the crash site in the French Alps on Tuesday, March 31. Flight 9525 was traveling from Barcelona, Spain, to Dusseldorf, Germany, when it crashed. Hide Caption 3 of 26 Photos: Germanwings plane crashes in France A helicopter drops rescue workers next to crash debris near Seyne-les-Alpes, France, on Sunday, March 29. Hide Caption 4 of 26 Photos: Germanwings plane crashes in France Forensic experts work near the crash site on Thursday, March 26. Hide Caption 5 of 26 Photos: Germanwings plane crashes in France Journalists stand in front of the Westerwald airfield in Montabaur, Germany, on March 27. Lubitz reportedly learned to fly here. Hide Caption 6 of 26 Photos: Germanwings plane crashes in France Investigators carry a computer from the home of Lubitz's parents in Montabaur, Germany, on Thursday, March 26. Hide Caption 7 of 26 Photos: Germanwings plane crashes in France A police officer stands guard March 26 at an apartment building where Lubitz was thought to have lived in Dusseldorf. Hide Caption 8 of 26 Photos: Germanwings plane crashes in France A helicopter lifts a rescue worker from the crash site on March 26. Hide Caption 9 of 26 Photos: Germanwings plane crashes in France Rescue workers continue to search the site of the crash on March 26. Hide Caption 10 of 26 Photos: Germanwings plane crashes in France Search-and-rescue teams land near the crash site on Wednesday, March 25. Hide Caption 11 of 26 Photos: Germanwings plane crashes in France Debris from the plane is seen along a mountainside on March 25. Hide Caption 12 of 26 Photos: Germanwings plane crashes in France French military personnel move up a mountainside March 25 near Seyne-les-Alpes. Hide Caption 13 of 26 Photos: Germanwings plane crashes in France The cockpit voice recorder of the Germanwings jet appears in this photo provided by the French air accident investigation bureau on March 25. The device is designed to capture all sounds on a plane's flight deck. Hide Caption 14 of 26 Photos: Germanwings plane crashes in France A helicopter comes in to land near Seyne-les-Alpes, the staging ground for search efforts, on March 25. Hide Caption 15 of 26 Photos: Germanwings plane crashes in France Rescue workers and members of the French Gendarmerie gather in Seyne-les-Alpes on Tuesday, March 24, as search-and-rescue teams struggle to reach the remote crash. Hide Caption 16 of 26 Photos: Germanwings plane crashes in France Wreckage is seen at the crash site on March 24. Hide Caption 17 of 26 Photos: Germanwings plane crashes in France Response teams gather in Seyne-les-Alpes on March 24. Hide Caption 18 of 26 Photos: Germanwings plane crashes in France Relatives of the flight's passengers arrive at the airport in Barcelona on March 24. Hide Caption 19 of 26 Photos: Germanwings plane crashes in France People hold hands walking through the Dusseldorf Airport on March 24. Hide Caption 20 of 26 Photos: Germanwings plane crashes in France The arrivals board at the Dusseldorf Airport shows Germanwings Flight 9525 without a status on March 24. Hide Caption 21 of 26 Photos: Germanwings plane crashes in France People arrive at the Dusseldorf Airport on March 24. Hide Caption 22 of 26 Photos: Germanwings plane crashes in France An employee of Swissport, the handling agent of Germanwings flights from Barcelona, speaks by phone at the Barcelona-El Prat Airport on March 24. Hide Caption 23 of 26 Photos: Germanwings plane crashes in France Relatives of people involved in the crash arrive at the Barcelona airport on March 24. Hide Caption 24 of 26 Photos: Germanwings plane crashes in France A man in Madrid looks at a monitor with a map, released from the Flightradar24 website, showing the point where the plane's radar signal went missing. Hide Caption 25 of 26 Photos: Germanwings plane crashes in France This undated file photo shows the Germanwings Airbus A320 that crashed. Germanwings is a low-cost airline owned by the Lufthansa Group. Hide Caption 26 of 26 
 
 A simple stone memorial has been set up at Le Vernet, where grieving relatives of those killed have laid flowers and held prayers. 
 
 Safety investigation 
 
 The BEA, France's accident investigation agency, said its ongoing safety investigation was focusing on a more detailed analysis of the flight history leading up to the crash, based on the audio recovered from the cockpit voice recorder and any other available data. 
 
 "A deliberate act by a man with a disturbed psychological profile is a possible scenario," BEA spokeswoman Martine Del Bono told CNN. "The first step of the investigation is to describe more precisely what happened." 
 
 This will be based mainly on analysis of the cockpit voice recorder, to be supplemented by data from the flight data recorder if it is found, she said. 
 
 "But we will also look at other events with possibly similar scenarios, try to understand if there are systemic weaknesses which may contribute or facilitate such scenarios. 
 
 "We will in particular look at the cockpit door locking as well as the criteria and procedures applied to detect specific psychological profiles." ||||| (CNN) German investigators found antidepressants in the apartment of Germanwings co-pilot Andreas Lubitz this week, according to published reports. 
 
 Die Welt, a German newspaper, cited an unidentified senior investigator who said Lubitz suffered from a severe "psychosomatic illness" and German police seized prescription drugs that treat the condition. Lubitz suffered from a "severe subjective burnout syndrome" and from severe depression, the source told Die Welt. 
 
 The New York Times also reported that antidepressants were found during the search of his apartment. CNN has not been able to confirm the reports. 
 
 Investigators continued to work Saturday to piece together the secret life of Lubitz, who officials say was hiding an illness from his employers. He had been declared "unfit to work" by a doctor. 
 
 They were expected to question his relatives, friends and co-workers as they try to pin down what could have prompted the seemingly competent and stable co-pilot to steer a jetliner into a mountainside on Tuesday. 
 
 As their efforts continued, dozens of people attended a remembrance ceremony for the victims of the crash at a church in a nearby town, Digne-les-Bains. There were 150 people on board Germanwings Flight 9525, including Lubitz. 
 
 Relatives of the victims and local residents also gathered Saturday afternoon by a simple stone memorial set up near the crash site, in the village of Le Vernet. Flowers have been laid there, in the shadow of the snow-covered peaks of the French Alps. 
 
 JUST WATCHED Police search Germanwings co-pilot's home for clues Replay More Videos ... MUST WATCH Police search Germanwings co-pilot's home for clues 00:10 
 
 Mental health speculation 
 
 Much attention has focused on Lubitz's state of mind, with some media reports speculating that he may have had mental health issues. 
 
 Investigators found a letter in the waste bin of his Dusseldorf, Germany, apartment saying that Lubitz, 27, wasn't fit to do his job, city prosecutor Christoph Kumpa said Friday. The note, Kumpa said, had been "slashed." 
 
 Just what was ailing Lubitz hasn't been revealed. The New York Times and the Wall Street Journal, citing unnamed sources, reported Friday that Lubitz suffered from mental illness and kept his diagnosis concealed from his employer. 
 
 A subsequent New York Times report on Saturday, citing two officials with knowledge of the investigation, said Lubitz sought treatment before the crash for vision problems that might have put his career at risk. According to those unnamed officials, Lubitz also was being treated for psychological issues. Other media reports indicate he was treated for depression. 
 
 Lubitz passed his annual pilot recertification medical examination in summer 2014, a German aviation source told CNN. 
 
 An official with Lufthansa, which owns Germanwings, said the exam only tests physical health, not psychological health, and that if Lubitz had vision problems that would have been discovered during the tests. 
 
 "We can't believe it. If anything was wrong with his eyes during the physical exam we would have known," the official says. 
 
 The Lufthansa official also said the company was never given any indication Lubitz was depressed, and that if he went to a doctor on his own he would have been required to self-report if he had been deemed unfit to fly. 
 
 A Dusseldorf clinic said he'd gone there twice, most recently on March 10, "concerning a diagnosis." But the University Clinic said it had not treated Lubitz for depression. 
 
 German investigators said they still have interviews and other work to do before they can reveal what they gleaned from the records found in the apartment and at his parents' home in the town of Montabaur. 
 
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 But the fact that investigators found "ripped, recent medical leave notes, including for the day of the offense, leads to the preliminary conclusion that the deceased kept his illness secret from his employer and his professional environment," prosecutors said. 
 
 Germanwings corroborated that assertion, saying it had never received a sick note from Lubitz. 
 
 Authorities left Lubitz's apartment Friday night with boxes of papers and evidence folders after spending about 90 minutes inside. 
 
 Investigators exchange information 
 
 Dusseldorf police said Saturday that a small team of French investigators had arrived in the city and that they were sharing information. 
 
 Jean Pierre Michel, lead investigator for the French inquiry, told French TV from Dusseldorf that the French team would work in "full transparency" with their German counterparts. 
 
 "We will interview people related to the investigation in the coming days. The hearings will be conducted in the coming days and weeks," he said, according to CNN's French affiliate BFMTV. 
 
 Asked by a journalist about reports of Lubitz's possible mental illness, he replied: "The elements of the investigation are strictly confidential and we cannot address these matters today." 
 
 No scenario can yet be ruled out, including mechanical failure, "as we do not have the necessary evidence," he said. 
 
 The German tabloid newspaper Bild said Saturday it had interviewed an ex-girlfriend of Lubitz. The woman is not named in the story and CNN has not been able to verify the report independently. 
 
 According to Bild, the ex-girlfriend said Lubitz was a very nice and sensitive man who needed a lot of care and attention, and he was very troubled. She said he would get into fights with her. 
 
 The newspaper also cited the ex-girlfriend as saying that Lubitz had bad dreams that his plane was going down. 
 
 Relative names flight captain 
 
 Patrick Sondenheimer was the pilot of Germanwings Flight 9525, according to Reiner Sondenheimer of Dusseldorf, Germany, who says he is a relative of Patrick's. 
 
 Patrick Sondenheimer is the pilot believed to have been locked out of the cockpit by his co-pilot, Lubitz. 
 
 JUST WATCHED Germanwings pilot identified Replay More Videos ... MUST WATCH Germanwings pilot identified 01:38 
 
 CNN spoke to Reiner Sondenheimer at his Dusseldorf apartment. Also at the apartment was a woman who did not provide her name but said she was Patrick Sodenheimer's relative. That woman also said that Patrick Sondenheimer was on the doomed flight. 
 
 Reiner Sondenheimer declined to say anything else, other than the family wanted time to grieve. 
 
 The pilot has not been named by German authorities. 
 
 Another Germanwings pilot who once flew with Lubitz, Frank Woiton, told WDR, a local broadcaster belonging to CNN's German affiliate ARD, that his impression of Lubitz was that he was "friendly" and that there was "nothing suspicious." 
 
 Woiton also said Lubitz "was a good pilot and had a good command of the plane." 
 
 Woiton's first job after he found out about the crash was the route Dusseldorf-Barcelona-Dusseldorf -- the same route as had been taken by Germanwings Flight 9525 a day earlier. 
 
 He was praised in German media for the emotional announcement he made to passengers before takeoff, in which he said the crew, like everyone else on the plane, wanted to get home safely to their families. 
 
 Perilous recovery operation 
 
 At the scene of the crash, two helicopters were being deployed above the mountainside by recovery crews Saturday. The weather has improved after high winds Friday made their complex task even more treacherous 
 
 Lt. Col. Xavier Vialenc, a spokesman for the Gendarmerie, told CNN there were about 40 officers at the crash site Saturday. 
 
 Once at the crash site, recovery workers spend all day working there, he said. Back in Seyne-les-Alpes at the end of the day, they can see a psychologist if they choose and have a debriefing session with all the workers. 
 
 Vialenc said the operations were going well so far and that the progress made was meeting their expectations. 
 
 Yves Naffrechoux, captain of rescue operations at Seyne-les-Alpes, told CNN on Friday that rescuers have found bodies at the rugged crash site, but few of them are intact. 
 
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 It could be weeks before all the bodies are recovered, identified and released to the families, authorities said. 
 
 The mountainous terrain where the Germanwings jet went down is difficult to access. 
 
 Airline: Lubitz passed initial tests 
 
 What could have prompted Lubitz to deliberately destroy the aircraft, killing everyone on board, remains the focus of investigators in Germany. 
 
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 He had passed medical and psychological testing when he was hired in 2013, said Carsten Spohr , CEO of Lufthansa, which owns Germanwings. 
 
 Spohr also told reporters that Lubitz had "interrupted" his pilot training, which he began in 2008. That break lasted several months, he said, but added that such an interruption isn't uncommon. Spohr didn't give a reason for the break. 
 
 While the ailment Lubitz had sought treatment for hasn't been revealed, that he was declared unfit for work is an important detail, aviation analysts say. Pilots are required to maintain their fitness to fly and must tell their airline if they're found unfit, CNN aviation analyst David Soucie said. 
 
 Although authorities have recovered the cockpit voice recorder, the flight data recorder remains missing. It could shed crucial details about what happened inside the cockpit, authorities say. 
 
 Banging and screaming 
 
 Lubitz was the co-pilot on Tuesday's flight between Barcelona, Spain, and Dusseldorf when he apparently locked the captain out of the cockpit, then activated a control causing the plane to descend toward rugged terrain. 
 
 Germanwings said the plane dropped for about eight minutes from its cruising altitude of 38,000 feet before crashing. 
 
 The only sounds , authorities said, were those of pounding on the cockpit door, Lubitz's steady breathing and, eventually, screaming passengers. 
 
 Lubitz and 149 other people on board the plane died in an instant, authorities say. Most were from Germany and Spain.
– Police last night searched Germanwings co-pilot's Andreas Lubitz's apartment in Duesseldorf, Germany, and the home he shared with his parents in the small town of Montabaur, removing boxes of possessions and what one investigator called a potentially "significant clue" that will be taken for testing, reports the BBC. German prosecutors later announced that they found medical documents in the 27-year-old's home that indicate "an existing illness and appropriate medical treatment," reports the AP. Prosecutor Ralf Herrenbrueck further said that torn-up sick notes for the day of the crash "support the current preliminary assessment that the deceased hid his illness from his employer and colleagues." It's not clear if the notes and the "clue" are the same. Herrenbrueck says no suicide note or evidence of any political or religious motivation for Lubitz's actions were uncovered. An unconfirmed report in Germany's Bild newspaper stated that Lubitz was diagnosed with a "severe depressive episode" in 2009 and had to repeat flying classes because of depression. The German paper says Lubitz was having relationship problems with his girlfriend, and police are looking into whether he was having a "personal life crisis," the Guardian reports. So far, airline chiefs have said only that there "was a lengthy interruption in his training" six years ago and he passed all subsequent checks with "flying colors," reports Reuters.