LONDON - At least 12 people were killed, more than 70 injured and many others missing on Wednesday as a fire ripped through a high-rise apartment building in west London where residents had long warned of the potential risk of a catastrophic blaze.
Witnesses reported people jumping from parts of the 24-story building after being trapped by the advancing flames. A thick plume of smoke could be seen for miles around.
Children banged on closed windows as they were enveloped by the dark smoke. A woman dropped her baby from at least a dozen stories up, desperately hoping someone would catch the infant in the street below.
Hundreds of other residents, many of whom were asleep when the blaze broke out shortly before 1 a.m., were forced to flee down dark and smoky stairwells. Grenfell Tower, which is publicly subsidized housing that prioritizes low-income and disabled residents of one of London’s poshest neighborhoods, was engulfed within minutes, witnesses said.
‘‘It was like a horror movie. Smoke was coming from everywhere,’’ said building resident Adeeb, who hobbled down nine flights of stairs on crutches with his wife and three daughters.
Adeeb, who declined to give his last name, said there had been no alarms and that he learned of the fire only when his daughter woke him.
‘‘She said, ‘I can see fire,’ and I opened the door and could see smoke,’’ added Adeeb, who is originally from Syria but has lived in Britain for 16 years. One of his daughters was hospitalized.
The fire raised immediate questions about how a recently renovated high-rise apartment building in the center of one of the world’s wealthiest cities could so quickly become a 24-story inferno. Residents had complained in recent months that the management company was flouting fire safety rules, including by providing inadequate escape routes.
In addition to the allegedly faulty alarm system, there apparently was no central sprinkler system in the building, according to residents who spoke to London’s Evening Standard newspaper. It remained unclear whether the building lacked sprinklers entirely, or whether they failed.
Officials said the cause of the fire was still being investigated. Terrorism was not suspected.
A witness interviewed by the BBC said his fourth-floor neighbor had awakened him around 1 a.m. to tell him that his ‘‘fridge had exploded.’’ Another witness told the broadcaster that the concrete building’s exterior cladding, which was just added last year, had ‘‘burned like paper’’ as the fire leapt from one floor to the next.
‘‘It appears that the external cladding has significantly contributed to the spread of fire at Grenfell Tower,’’ said Angus Law, an expert with the Building Research Establishment Center for Fire Safety Engineering at the University of Edinburgh.
Law said that British regulations are intended to halt the spread of fire between units and floors in high-rise buildings, but that when that fails, ‘‘the consequences are often catastrophic.’’
London police said 12 people were confirmed dead but that they expected the toll to rise. Emergency services said at least 74 people were being treated at five area hospitals, with at least 10 in critical condition. The building housed about 500 people.
At least 40 fire engines responded to the scene, where 200 firefighters waged a futile battle to contain the blaze. Many rushed into the building wearing breathing tanks, searching floor by floor for survivors even amid concerns that the structure could collapse.
London Fire Commissioner Dany Cotton said a structural engineer was monitoring the stability of the building, but that it was still safe for rescue crews to enter. She said firefighters had climbed as high as the 20th floor to rescue residents and carry them down the building’s stairwell, and that the searches continued.
The fire, which was believed to have begun on one of the lower floors of the 120-unit building, was still burning as of noon in London, some 11 hours after it began.
‘‘This is an unprecedented incident,’’ Cotton said. ‘‘In my 29 years of being a firefighter, I have never ever seen anything of this scale.’’
Speaking within sight of the burning high-rise - originally white and gray, but most of which had turned a charred black - Cotton said she would not speculate on the ultimate death toll because of the ‘‘size and complexity’’ of the building.
Throughout the morning, witnesses reported harrowing scenes as residents trapped on top floors leaned out windows, flashing their cellphone lights and calling frantically for help.
James Wood, a 32-year-old graphic designer who lives in an adjacent building, said he saw a woman on about the 13th floor holding a baby out a window until all hope of a rescue had passed.
‘‘She dropped the baby,’’ he said. ‘‘I'm hoping it was into someone’s arms. But I don’t think the mother made it.’’
Another witness told Britain’s Press Association that a baby who was dropped from about half-way up the building was caught by an onlooker.
Wood said he also saw children, about 5 years old, banging on a closed window.
‘‘And then it was black smoke. It was all up in flames,’’ he said. ‘‘I know they didn’t make it.’’
Wood said he participated in a campaign to force the borough council to enhance the fire safety in his own public-housing building, but he said the council has not acted.
‘‘Anyone who earns below 10 million pounds a year is not human in this borough,’’ he said. ‘‘They don’t care about fire safety.’’
As of midday Wednesday, many people continued to search for loved ones.
Ahmed Chellat, a retired 60-year-old, said he was searching for his brother-in-law and his wife, as well as their three children, the youngest of whom is 8.
He said he spoke to the wife at 1:45 a.m. and that she was still in their apartment on the 21st floor.
‘‘She wasn’t panicked,’’ he said. ‘‘I said, ‘Why don’t you come out?’ She said, ‘They are telling us to stay in. They are asking us to cover doors with towels.’ ‘‘
Half an hour later, he called her again. ‘‘The last thing she said was, ‘Smoke was coming heavily into the flat.’ ‘‘
He later told television interviewers that he had found his relatives, alive.
From an adjacent building, he said he could see Grenfell’s exterior cladding, which he said was made of plastic, catch fire.
‘‘You could hear it cracking - hear it flying,’’ he said. ‘‘If it was brick, it would not have caught fire as quickly.’’
‘‘I never imagined this could happen in London,’’ he said.
London Mayor Sadiq Khan said there were ‘‘genuine questions that people across the country who live in tower blocks will have. They need to be answered.’’
But he said that for the time being, the focus is on search-and-rescue - but that it would soon shift to recovery of the dead.
By midmorning, an acrid smell permeated the area.
About 100 people - residents, worried family members and onlookers - stood outside the nearby Rugby Portobello community center. Some were still in their pajamas, having fled in a panic hours earlier.
Neighbors streamed into the center with food. One man pushed a baby stroller teetering with bottles of water, jugs of milk and cans of baked beans.
Grenfell Tower is surrounded by some of London’s most desired areas, home to celebrities, politicians and wealthy foreigners. It’s just a short walk from Kensington Palace. But the area also includes pockets of poverty, especially in a cluster of high-rise buildings that mark an unofficial western entry point to central London.
Residents of the building, which was constructed in 1974, had long warned of potential fire hazards even though it was completely renovated just last year.
‘‘It is our conviction that a serious fire in a tower block or similar high density residential property is the most likely reason that those who wield power at the KCTMO will be found out and brought to justice!’’ a residents organization, the Grenfell Action Group, wrote in a blog post last year.
KCTMO, which stands for Kensington and Chelsea Tenant Management Organization, is the group that runs public housing on behalf of the Royal Borough of Kensington and Chelsea, the west London area where the fire broke out.
On Wednesday morning, the Grenfell Action Group’s website was updated, with a post on the fire.
‘‘All our warnings fell on deaf ears, and we predicted that a catastrophe like this was inevitable and just a matter of time,’’ the post read.
Residents said they had been instructed by management before the blaze to stay in their apartments in the event of a fire and to wait for emergency services to arrive. They said they had been told that their units were fireproof for at least an hour.
Rydon, the company that handled last year’s $11 million renovation, issued a statement saying its work ‘‘met all required building control, fire regulation and health and safety standards.’’ The firm said it would cooperate with investigators.
The management company issued a late-afternoon statement in which it acknowledged that residents had raised concerns. It vowed to ‘‘co-operate fully with all the relevant authorities in order to ascertain the cause of this tragedy.’’
Nick Paget-Brown, who leads the borough council, told the BBC that there would be ‘‘a thorough investigation into ‘‘why the fire started and why it spread so quickly.’’
He acknowledged that residents had expressed concerns before the fire, but he did not specifically address them Wednesday. ‘‘There are always concerns about fire safety in high-rise buildings,’’ he said.
Watch: Inferno at London high rise
Watch: A witness tells the BBC what she saw
Watch: Witness says there were signs of survivors
Watch: More videos from the scene
Material from the Associated Press was used in this report.