Commissioner Dany Cotton termed the fire an "unprecedented incident" and said she has never seen anything on this scale in her 29-year career.
She told LBC: "I think he might have just had some broken bones and bruises".
"I have lived here nearly 21 years and I have never seen anything like this, at first I thought it was terrorism, we were just panicking".
Joanna O'Connor, a local resident, told Sky News: "At about 2am woken up by screaming, sirens and helicopters". "I watched flames burst out of our window and our flat was engulfed in flames", he said. The windows were slightly ajar, a woman was gesturing that she was about to throw her baby and if somebody could catch her baby.
"As we were coming down the stairs the smoke was disgusting - it's all the plastic on the building that's done it". It also made the tasks of firefighters trying to control the blaze more risky.
Actor and writer Tim Downie, who lives nearby, said: "It's horrendous".
He said: "It's horrendous".
Meanwhile the flames spread to the roof of the building.
"I am very sad to confirm that there have been a number of fatalities, I can not confirm the number at this time due to the size and complexity of this building".
"It's the most terrifying thing I've ever seen". "I came out to my back garden and saw (the fire)". I saw it engulfed in flames.
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People are rushing to help residents affected by the horrendous blaze that engulfed a north Kensington block of flats.
"I was watching TV in bed and I could smell smoke and then I heard a fire engine and I jumped up".
"All our warnings fell on deaf ears and we predicted that a catastrophe like this was inevitable and just a matter of time", the group said in a blog after the fire broke out. "It's so heartbreaking, I've seen someone flashing their torches at the top level and they obviously can't get out", a man told the BBC.
"... There's a huge amount of debris that is falling off this building".
The fire has been burning for more than three hours and stretches from the second to the 24th floor of the building.
He added that given the thickness of the smoke, he would be surprised if anyone could have left the building without assistance. "Last time I saw him they were waving out the window, his wife and children", she said, sitting outside the Rugby Portobello community center.
A number of unofficial online crowd funds have sprung up, many of which have already raised thousands to help the survivors of the fire. You could hear people screaming.
"(If I were asleep), we would have all been dead - that's how bad it was", he said. I'm 100 metres away and I'm absolutely covered in ash.
"This is a large and very serious incident and we have deployed numerous resources and specialist appliances", he said. More than 20 ambulance crews and a hazardous area response team were also dispatched. "Questions need to be answered as soon as possible", said London mayor Sadiq Khan. He said that the patients were being treated for a range of injuries and smoke inhalation.
A massive fire that tore through a 24-story apartment building in west London has claimed a number of lives, fire officials confirmed, as rescuers frantically worked to reach people believed still trapped. "An evacuation process is underway", said the Metropolitan Police.
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Kensington and Chelsea Council leader Nick Paget-Brown described the blaze as a "very, very severe fire".
"It was clear that the fire service could not cope with the fire".
"Several hundred would have been in there".
"As the fire progressed, you could hear screams of agony from people", she said.
"I got dressed, went downstairs and saw a neighbor". "There's a lot more work to do to evacuate the building and to establish how safe it is".
"Officers, the London Fire Brigade and the London Ambulance Service are now at the scene".
An acrid column of smoke could be seen rising from the building shortly before 7am.
Schoolboy Omar Kalam, 11, was standing anxiously at the emergency service cordon with father Walid, 44. "I'm anxious about my building now", she said. I have just watched dozens just fall off as I'm speaking to you right now.
Anyone anxious for loved ones in the blaze can contact the Met Police casualty bureau on 0800 0961 233.
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