Crews recovered just two more bodies on the third day of an excruciating search through the charred remains of a Quebec retirement home, now covered in ice as thick as two feet.
A total of 32 people are believed to have been killed in the massive fire, but just 10 bodies have been found.
The cause of Thursday's blaze in the small town of L'Isle-Verte remains under investigation. There were media reports that the fire began in the room of a resident who was smoking a cigarette, but police said that was just one possibility among many.
"It could be a cigarette, it could be a small heater, it could be an electrical problem," Police Lieutenant Michel Brunet said. "We have to be sure at 100 percent.
"We're going to take the time we need."
Frigid temperatures continued to hamper the search yesterday. Quebec police said the ice in some places was as thick as two feet.
Search teams brought in equipment normally used to de-ice ships that pushes out very hot air.
Officials said they would end the day's search at 7pm local time due to the difficult conditions and resume this morning.
Police lowered the number of missing from about 30 to 22 based on more detailed information.
Spokesman Guy Lapointe said: " I think we can all agree here today that the ...people who are still missing, I think we can assume the worst."
The coroner's office identified two victims yesterday, Juliette Saindon, 95, and Marie-Laureat Dube, 82. A third person has been identified but the name will not be released until today.
Teams of police, firefighters and coroners methodically picked their way through the ruins of Residence du Havre, working in shifts in the extreme cold.
Spray from firefighters' hoses had left the home resembling a macabre snow palace.
About 20 elderly residents survived the fire.
Some were moved to other residences for the elderly in the area, and the Red Cross had raised about 200,000 Canadian dollars (£110,000) to provide clothes, hearing aids, wheelchairs, and other urgent needs.
"Because they left their residence so quickly, they left with nothing," said Myrian Marotte, a Red Cross spokeswoman.
"We're looking at providing them with those very urgent articles."
Many of those who died were confined to wheelchairs or used walkers, and some had Alzheimer's. Firefighters responded within minutes of getting the alarm but said they could only reach one-third of the building because the fire was too intense.
The tragedy has devastated the town of 1,500 people 140 miles north-east of Quebec City. Quebec minister of social services Veronique Hivon said many of the village's volunteer firefighters had relatives at the retirement home.
Father Gilles Frigon, the town's Catholic priest, said he would hold a private Mass so residents could gather and share their grief. He has invited family members to bring photos of their loved ones.
"It will be family-oriented and intimate, so that in this tragic event we're going through, we can find ourselves and rebuild our hearts," he said.
A more official memorial ceremony featuring dignitaries has been scheduled for February 1.
The fire came six months after 47 people were killed in the small town of Lac-Megantic, Quebec, when a train carrying oil derailed and exploded.
In 1969, a nursing home fire in the community of Notre-Dame-du-Lac, Quebec, claimed 54 lives.