A nighttime fire ripped through a rundown apartment building mainly occupied by homeless people and squatters in Johannesburg, forcing some to throw babies out of third-story windows in a desperate attempt to save them and leaving at least 73 people dead early Thursday, witnesses and emergency services in South Africa鈥檚 biggest city said.

At least seven of the victims were children, the youngest a 1-year-old, according to an emergency services spokesperson. A South African television station reported that the number had climbed to 12 children dead, although emergency services didn鈥檛 immediately confirm that.

More than 50 people were injured and emergency services officials warned that the death toll could still rise as they continued to search the scene more than 12 hours after the blaze broke out at around 1 a.m.

Dozens of bodies recovered by firefighters lay on a side road outside the apartment block, some in body bags but others covered in silver sheets or blankets after the body bags ran out.

鈥淥ver 20 years in the service, I鈥檝e never come across something like this,鈥� Johannesburg Emergency Services Management spokesperson Robert Mulaudzi said.

Authorities hadn鈥檛 established the cause of the fire but Mgcini Tshwaku, a local government official, said the initial evidence suggested it started with a candle. Inhabitants used candles and fires for light and to keep warm in the winter cold, he said.

Firefighters were still making their way through the remnants of shacks and other informal structures that littered the inside of the derelict five-story building in the heart of Johannesburg鈥檚 central business district. Smoke seeped out of the blackened building even though the fire was out, while twisted blankets and sheets hung like ropes out of shattered windows to show how people had used them to try and escape the flames.

Some of the survivors described how they jumped out of windows to escape the blaze, but only after tossing their children to others below.

鈥淓verything happened so fast and I only had time to throw the baby out,鈥� said Adam Taiwo, who managed to save his 1-year-old son and himself. 鈥淚 also followed him after they caught him downstairs.鈥� Taiwo said he did not know where his wife, Joyce, was.

A witness who lives in a building across the road said he saw others also throw babies out of the burning building and that at least one man died when he jumped from a window on the third floor and hit the concrete sidewalk 鈥渉ead first.鈥�

Another witness who didn鈥檛 give his name told television news channel eNCA that he lived in a building next door and heard people screaming for help and shouting 鈥淲e鈥檙e dying in here鈥� when the fire started.

As the fire raged, some occupants got trapped behind locked gates at the exits and it was clear there were no proper fire escape routes, local official Tshwaku said.

鈥淧eople couldn鈥檛 get out,鈥� he said, adding that some of the victims may have died after jumping out of the building.

As many as 200 people may have been living in the building, witnesses said, including in the basement, which should have been used as a parking garage. Others estimated an even higher number of occupants.

Johannesburg mayor Kabelo Gwamanda said 141 families were affected by the tragedy but could not say exactly how many people were in the building when the fire started. Many of the people inside were foreign nationals, he said. That could make identifying victims and tracing the missing hard as many were likely in South Africa illegally, other officials said, and had no South African documents.

A woman who asked not to be identified said she lived in the building and escaped the flames with her grown son and 2-year-old child. She stood outside holding the toddler for hours and said she didn鈥檛 know what happened to two other children from her family.

鈥淚 just saw smoke everywhere and I just ran out with this baby only,鈥� the woman said. 鈥淚 don鈥檛 have any home, and I don鈥檛 know what to do anymore.鈥�

In a statement, South African President Cyril Ramaphosa said, 鈥渢his is a great tragedy felt by families whose loved ones perished in this awful manner, and our hearts go out to every person affected by this event.鈥�

A spokesperson for Ramaphosa said he had offered the assistance of the national disaster management agency if needed.

Johannesburg is rated as Africa鈥檚 richest city but its center is rundown and often neglected. Abandoned and broken-down buildings are common, and people desperate for some form of accommodation use them for shelter. City authorities refer to the structures as 鈥渉ijacked buildings鈥� and they have been a problem for years, if not decades.

While city authorities were catching much of the blame for the deaths, they said it was often difficult to get courts to issue orders to evict the homeless from such buildings.

The building in question was reportedly owned by the city of Johannesburg and is considered a heritage site, but was not being managed by the city. It was once the site of South Africa鈥檚 notorious 鈥減ass鈥� office, which controlled the movement of Black people under the racist system of apartheid, according to a blue historical plaque hanging at the entrance.

鈥淒enied a place in the city, many were ordered to leave Johannesburg,鈥� the plaque reads.

Decades later, the deadly fire made the building a modern emblem of the exclusion of poor people in Johannesburg.

Speaking at the scene, the Gauteng province鈥檚 police commissioner, Lt. Gen. Elias Mawela, said authorities were aware of approximately 700 buildings in central Johannesburg that were derelict and abandoned. He urged city authorities to act.

鈥淪hut it down. That building.鈥� Mawela said.

Meanwhile, Mulaudzi, the emergency services spokesperson, said Thursday鈥檚 fire took three hours to contain and firefighters needed time to work through all five floors.

He said there were 鈥渙bstructions鈥� everywhere that would have made it very difficult for residents to escape the deadly blaze and which hindered emergency crews trying to work through the site.

The chance of anyone else being found alive hours after the fire broke out was 鈥渧ery slim,鈥� Mulaudzi said.

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Imray reported from Cape Town, South Africa. AP writer Cara Anna in Nairobi, Kenya contributed to this report.

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AP Africa news: https://apnews.com/hub/africa