Several people have died after a huge fire raged through the night at a multistoried apartment building in west London, reports BBC quoting a fire official.
Eyewitnesses said they saw people trapped inside the burning Grenfell Tower, in north Kensington, screaming for help, and shouting for their children to be saved.
More than 50 people are being treated in hospital, says London Ambulance.
The whole 24-storey block had been alight and there were fears the building might collapse, said a BBC personnel.
London Metropolitan Police has set up an emergency number on 0800 0961 233 for anyone concerned about friends or family.
London Fire Commissioner Dany Cotton said there had been "a number of fatalities" but she could not say how many because of the "size and complexity" of the building.
"This is an unprecedented incident," she told reporters. "In my 29 years of being a firefighter, I have never ever seen anything of this scale."
She said the cause was not yet known.
Paul Munakr, who lives on the seventh floor, managed to escape.
"As I was going down the stairs, there were firefighters, truly amazing firefighters that were actually going upstairs, to the fire, trying to get as many people out the building as possible," he told the BBC.
He said he was alerted to the fire not by fire alarms but by people on the street below, shouting "don't jump, don't jump".
Eyewitness Jody Martin said: "I watched one person falling out, I watched another woman holding her baby out the window... hearing screams.
"I was yelling at everyone to get down and they were saying 'We can't leave our apartments, the smoke is too bad on the corridors.'"
London Mayor Sadiq Khan said questions will need to be answered over the safety of tower blocks.
"We can't have a situation where people's safety is put at risk because of bad advice being given or if it is the case, as has been alleged, of tower blocks not being properly serviced or maintained," he told BBC Radio.
"Several hundred" people would have been in the block when the fire broke out, leader of Kensington and Chelsea Borough Nick Paget-Brown said.
Tim Downie, another eyewitness, told the BBC part of the building was "completely burned away".
BDST: 1506 HRS, JUN 14, 2017
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