By mid-day, London police said six people had been killed and they cautioned the death toll was likely to rise.
Founder Haley Yearwood wrote: "In this tight-knit community, many families have lost everything they own, whilst others have lost their lives. I am sad to confirm that we now know there have been fatalities and more than fifty people have been taken to hospitals including Royal Free, King's St. Thomas's, St Mary's and Chelsea and Westminster to be treated for injuries", Khan said.
London Fire Brigade said the fire engulfed all floors from the second to the top of the block which contained 130 apartments.
A massive fire tore through a 27-storey apartment block in London before dawn on Wednesday, causing fatalities and injuring dozens, with terrified residents trapped inside.
Grenfell Tower in Latimer Road, White City, is now "lurching" to one side after a "very, very severe fire" broke out in the early hours of Wednesday morning, with those inside claiming a fire alarm failed to sound. Some people threw their children from windows and others jumped from upper floors.
He said: "We pray for all the residents of Grenfell Tower".
Khan had been called to respond after reports that people had been advised in advance to remain in their flats in the event of fire.
Police say it will take some time to confirm the cause of the fire.
"People can be seen at the windows, including one man waving a blanket from the window", a witness told The Guardian.
"There's people at their windows: 'Help me, help me, help me!' You can see the fire go into the house and into the last room that they're in, and just engulfing their whole apartment". "A gentleman ran forward and managed to grab the baby".
The regeneration of the tower block included extensive remodelling of the bottom four floors, creating nine additional homes.
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Another witness, who only gave her first name, Hanan, told ABC News that she managed to escape from the building's ninth floor, but she said was anxious about her brother, Abdul Aziz, and his family, who were on the 26th floor.
Eddie, a 55-year-old resident from the Grenfell Action Group, told AFP he too had been complaining for years.
Sang, another person evacuated from her home, said there had been a notice in the lifts telling residents to stay in their flats if there was a fire.
Stuart Crichton, the Ambulance Service's assistant director of operations, says 100 medics are on the scene, together with ambulance crews and advanced trauma teams.
Dany Cotton, the London Fire Commissioner, said: 'This is an unprecedented incident.
She said her friend, with her five children, were all unaccounted for.
Police said they were called to the scene of the blaze at 1:16 a.m. local time (0016 UTC).
The local council has since encouraged any more people affected by the fire to go to the Westway Sports Centre in Crowthorne Road, as many others are "reaching capacity".
Nearby buildings are being evacuated as fears increase that the building, in a heavily populated area, may collapse.
"My brother has friends and they live in there", he said.
More than 12 hours after the fire was seen in the complex, over 250 firefighters continued to battle the leaping flames and thick, choking smoke.