DNA tests will be needed to identify many of the 153 people killed in Wednesday's plane disaster at Madrid airport, the Spanish government says.
Deputy Prime Minister Maria Teresa Fernandez de la Vega said experts had so far only been able Spanish airliner crash kills 153 ...
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The air disaster, in which a departing jet caught fire after veering off the runway, was Spain's worst in 25 years.
Vigils were held on Thursday to remember those who died.
It will be weeks, maybe months, before the truth is known about what caused the plane to crash, the BBC's Johnny Dymond reports from Madrid.
There has been much criticism of the flight operator, Spanair, but there is little to back it up at present, our correspondent says.
Until the contents of the flight recorders are analysed, the final minutes of the flight will remain a mystery, he adds.
Nineteen foreigners
The remains of the dead have all been taken to a morgue at Madrid's Ifema congress centre, which was used to collect victims of the Madrid train bombings of 2004.
"All of them have undergone autopsies," said Ms Fernandez de la Vega.
"The investigation commission is working very intensively, and hand in hand with foreign experts."
See details of the crash site
Of the survivors of the Spanair flight JK 5022 crash on Wednesday, several remain critically ill.
Four are in a "very serious" condition, with another listed as "serious", Spanish media reported.
But five of six people classed as "serious" showned signs of improvement on Thursday, according to Spanish news agency Efe.
Eight of the injured remain under observation with one only slightly injured, Spanish media said.
Two babies and 20 children were on board the flight, which was heading from Madrid to Las Palmas in the Canary Islands, according to Spanair, which released the official passenger manifest.
Nineteen foreigners from at least 11 countries were on the plane, the Spanish government said.
The countries include Germany, France, Sweden, Mauritania, Turkey, Brazil, Indonesia, Bulgaria, Italy, Colombia and Gambia.
Spanish leaders met relatives of the victims on Thursday as the country observed national mourning.
Engine theory
The Spanair flight, bound for Las Palmas in the Canary Islands, took off on Wednesday at lunchtime with 172 people on board, among them 10 crew.
Initial reports suggested a fire had broken out in one of the MD82 plane's engines during or shortly after take-off, and the plane ended up in a field.
Spanish Transport Minister Magdalena Alvarez said the plane had earlier begun taxiing to the runway, before turning back because of a technical problem, which had caused an hour's delay in take-off.
Spanish media said the pilots had reported a fault with a temperature gauge, but it was thought to have been fixed before take-off.
Speaking on Thursday, Ms Alvarez said a thorough investigation would be carried out, with a full examination of the flight recorders and available pictures, but that it was very early to draw conclusions about the crash.
A special independent commission has been established to investigate the cause of the crash, Spanish media reported.
The plane which crashed was a 15-year-old McDonnell Douglas MD82 plane previously owned and operated by Korean Air.
Reports said it was serviced regularly and had been pronounced fit to fly.
The MD82 is known as a versatile and reliable aircraft, with some 432 planes currently in service around the world, Efe said.
People concerned for relatives or friends who might have been on board the plane can call Spanair's helpline on +34 800 400 200 (calls possible from inside Spain only).
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