The families of victims of the Germanwings plane crash face a wait of up to four months for the remains of their loved ones to be identified , it has emerged . The Head of the Criminal Research Institute at France 's National Gendarmerie said DNA identification of the victims would take two to four months . Colonel Francois Daoust , the institute 's director , said : 'Subject to the amount of body parts found , the time period could fluctuate between two months at the least , and four months . Scroll down for video . French gendarmes and investigators work amongst the debris of the Airbus A320 at the site of the crash , near Seyne-les-Alpes . The families of victims of the Germanwings plane crash face a wait of up to four months for the remains of their loved ones to be identified . Grieving relatives are pictured at a memorial in Le Vernet , France . Friends of students killed in the disaster hugged each other outside an emotional memorial service last week . 'It is better to work at the rhythm of the science than to rush ahead and thereby run the risk of making mistakes in the identification . ' 'We can not promise that we will be able to identify all of the victims , ' he added , according to German newspaper Bild . German prosecutors said Andreas Lubitz , 27 , who deliberately caused the crash in the French Alps , had therapy for suicidal tendencies some time before getting his pilot 's licence . And he was being treated by a psychotherapist , Dusseldorf prosecutor 's office spokesman Christoph Kumpa said . 'At that time he was being treated for what is documented as being suicidal , ' Mr Kumpa said . He added that Lubitz paid several visits to doctors right up until the time of the crash but these did not involve suicidal tendencies . Andreas Lubitz ( pictured ) , who deliberately caused the crash in the French Alps , had therapy for suicidal tendencies some time before getting his pilot 's licence , German prosecutors said . A top police boss in France has warned that his department ' can not promise ' that it will be able to identify all of the victims . No suicide note 'or anything like that ' was found in searches of Lubitz 's German residences , Mr Kumpa said . There was also nothing in his personal , family or professional background to provide any hints 'about his motivation ' , he said . He also said Lubitz was not suffering from any 'organic medical illness ' . Cockpit voice recorder evidence has indicated that Lubitz deliberately put the Airbus A320 into a descent after locking out the captain . All 150 people on board , including three Britons , were killed in the crash last Tuesday . Work to collect debris and find the second black box continues to take place at the crash site of the Germanwings Airbus A320 - but it could be months before the remains of victims are identified . Mr Kumpa was speaking as the grim search for remains carried on in southern France . There were reports that Lubitz 's girlfriend was pregnant with his child and that the co-pilot , as well as having mental health issues , had been receiving treatment for an unspecified vision problem which could have affected his ability to carry on working as a pilot . Authorities have already revealed that he hid from his employers a sick note declaring him unfit to work on the day of the disaster , and German newspaper Bild has said he previously told an ex-girlfriend : 'One day I will do something that will change the whole system , and then all will know my name and remember it . ' The Britons killed were Paul Bramley , 28 , originally from Hull , Martyn Matthews , 50 , from Wolverhampton , and seven-month-old Julian Pracz-Bandres , from Manchester , who died alongside his mother , Marina Bandres Lopez Belio , 37 , originally from Spain .
DNA identification of victims will take two to four months , police chief says . Warning came from the Head of the Criminal Research Institute in France . Colonel Andreas Lubitz fears it may not be possible to identify all victims .