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By Samantha Granville in Johannesburg & Antoinette Radford in London
BBC News
At least 74 people have died - including 12 children - after a Johannesburg building fire.
More than 50 others were injured.
Officials say it is unclear what sparked the blaze at the city centre five-storey building, which had been abandoned but was being occupied by homeless people.
South African President Cyril Ramaphosa called it a "tragedy", adding that the "unprecedented" incident was a "wake-up call".
In a news conference at the site of the fire, Mr Ramaphosa commended emergency services, who arrived at the scene 10 minutes after the fire was reported.
Ten of the bodies recovered from the fire were unidentifiable, a representative of the health department told the news conference.
Johannesburg city manager Floyd Brink said 200 families were affected by the fire and "all efforts" were taken to provide accommodation.
Johannesburg mayor Kabelo Gwamanda said displaced survivors would have temporary accommodation for three days.
"After 72 hours, the human settlements department will advise on where they will be taken," Mr Gwamanda said in a statement.
Mr Ramaphosa said people who needed assistance, from accommodation to counselling, "will be looked after".
He hopes investigations into the fire will allow both communities and authorities to prevent a repeat of such a tragedy.
"It's a wake-up call for us to begin to address the situation of housing in the inner city," the South African president said.
Earlier, the city of Johannesburg confirmed that it owned the building, but said cartels had taken it over.
A spokesman for the emergency services, Robert Mulaudzi, told the BBC that firefighters had been able to bring out some of the occupants.
He said the fire had gutted the building and the search for other victims was continuing.
Speaking separately to Newzroom Afrika, Mr Mulaudzi said that the youngest of the seven children who died was 18 months old.
Disaster management officials are also in the area to help provide relief for surviving residents.
Mr Mulaudzi said the scene would be handed over to the South African police service after emergency services had finished searching for victims.
"We are moving floor by floor conducting these body recoveries," Mr Mulaudzi told local broadcaster ENCA.
A video posted by Mr Mulaudzi to the platform X, formerly known as Twitter, showed fire trucks and ambulances outside the building with burnt-out windows.
Photos from the scene showed covered bodies lined up near the burned building.
One woman told journalists she was outside the building searching for her 24-year-old daughter.
"As soon as I heard the building was burning down, I knew I had to run here to come and look for her," she said.
"Now that I'm here, I'm kept in suspense because I really don't know what is happening. I don't get any direction - so I'm actually very anxious, I don't know if my daughter is alive."
The building is located in what was formerly a business district in South Africa's economic hub. It was being used as an informal settlement, Mr Mulaudzi said.
The inner city neighbourhood is infamous for "hijacked" buildings, a term used in South Africa to refer to buildings illegally taken over by criminal gangs who then charge rent. Some of those who use the buildings include undocumented migrants, mostly from other African countries.
Mr Mulaudzi told the BBC that the building had been abandoned previously, but homeless people had moved in looking for shelter during the current cold winter months.
He added that since it was not a formal accommodation with a lease, the building was not properly looked after, and makeshift structures and debris had made it hard to search for and rescue people.
Lebogang Maile, the politician responsible for housing in the province, said there was a chronic problem with housing in the area, with 1.2 million people looking for somewhere to live.
When asked whether his administration would take responsibility for the tragedy, the Mayor of Johannesburg, Kabelo Gwamanda, said the government was dealing with the issue of cartels hijacking buildings which was taking place across the city.
In a visit to the scene of the deadly fire, Mr Gwamanda said Johannesburg officials would relocate people living in similar "hijacked" buildings in the city, and turn those buildings into social housing. "We are not going there with brute force," he told reporters, "we are trying to apply a sensitive strategy."
Firefighter Mr Mulaudzi told the BBC that in his 23 years of service, he had "never come across something like this". The emergency services spokesman added that Johannesburg "must do something about it as a city, working together, to make sure we prevent incidents like this one".
In the wake of the fire, many South Africans on social media condemned the online xenophobic attacks that some have made against the victims and survivors of the fire.
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