Frantic parents have been combing through the Swiss ski resort of Crans-Montana in search of their missing children after Thursday's devastating nightclub fire.
Between 40 and 47 people - largely young people ringing in the New Year - died following the blaze.
The fire ripped through Le Constellation bar in the early hours of Thursday morning, leaving 115 people injured, many with critical wounds.
Eighteen-year-old Rayan Guiren told reporters: "Many parents have been searching for their children."
One mother has been telephoning every hospital in the region attempting to locate her 16-year-old son, so far without success.
Foreign embassies are working urgently to determine whether their nationals were among those caught up in what has become one of Switzerland's worst modern disasters.
Investigators began the grim work of putting names to the charred remains on Friday, with Swiss officials cautioning that the process could stretch on for days or even weeks.
The severity of burns sustained by the crowd has made identification exceptionally hard.
Crans-Montana's mayor Nicolas Feraud said at a Thursday evening press conference: "The first objective is to assign names to all the bodies."
Footage from inside the bar showed the moment fire began to spread across the ceiling in a 'flashover'
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Forensic teams are relying on dental records and DNA analysis to confirm their identities.
Mathias Reynard, who leads the Valais cantonal government, explained: "All this work needs to be done because the information is so terrible and sensitive that nothing can be told to the families unless we are 100 percent sure."
Witness accounts suggest the inferno may have started when sparklers ignited material on the basement venue's ceiling shortly after 1.30am.
And new footage appears to show the same, with crowds dispersing as flames began licking at soundproof material up above.
Two French survivors, Emma and Albane, recalled: "In a matter of seconds, the entire ceiling was ablaze. Everything was made of wood."
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Forensic teams at the scene are relying on dental records and DNA analysis to confirm their identities
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The flames then spread at speed through the space, with escape routes proving treacherous due to narrow passages and stairs.
Oscar, 19, described scenes resembling "a horror movie" as panicked revellers banged on windows and scrambled over one another to flee.
He told Sky News that some victims' faces were "completely gone" from burns, yet adrenaline meant many did not realise the extent of their injuries.
The Italian Foreign Ministry confirmed 16 of its nationals remained unaccounted for, with between 12 and 15 others receiving hospital treatment.
On Thursday evening, hundreds gathered in silence for a vigil near the cordoned-off scene
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France's foreign ministry reported eight missing citizens and could not exclude the possibility that French nationals were among the dead.
It remains unclear if any Britons were involved in the fire.
Patients with severe burns were transferred to specialist units across Switzerland, including facilities in Lausanne, Zurich and Geneva, where doctors described treating victims aged between 15 and 25 with third-degree injuries.
Switzerland has declared five days of national mourning, and on Thursday evening, hundreds gathered in silence near the cordoned-off scene, leaving flowers and lighting candles at a makeshift memorial as some wept and embraced.