Scotland Yard has opened a separate criminal investigation. Firefighters continued to pick their way through the burnt-out wreckage of the building Friday.
Just around the corner from the tower, a makeshift wall of condolences expressed people's grief and defiance.
Those who survived have been taken to local community centres, where they have been looked after by members of the wider community and been visited by politicians and members of the royal family.
Facing criticism for not meeting victims of the fire much sooner, British Prime Minister Theresa May visited the injured at a central London hospital on Friday.
"The package of support I'm announcing today is to give the victims the immediate support they need to care for themselves and for loved ones".
South Wales assistant chief fire officer Andrew Thomas said: "This type of fire is rare and high-rise buildings are created to resist fire, stop the spread of smoke and provide a safe means of escape".
Questions are growing about how the Grenfell Tower fire spread so quickly, focused on the cladding fitted to external walls as part of an £8.7 million ($11 million, 9.9 million euros) refit completed past year.
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According to the draw, Group A includes Russia , New Zealand , Portugal and Mexico, Group B - Chile, Australia and Germany. Under Russian law, foreign spectators can enter the country visa-free, with only identification documents and a Fan ID.
The Times newspaper reported that the company that manufactured the cladding also made fire-resistant models that cost fractionally more than the standard version.
The residential tower was built in 1974 and had been extensively refurbished in works that were completed a year ago. REUTERS/Toby Melville Demonstrators sit in the road in the West End, during a protest following the fire that destroyed The Grenfell Tower block, in north Kensington, West London, Britain June 16, 2017.
- How did the fire spread so fast?
Originally constructed in 1974, the residential tower block recently underwent a $13.2 million (£10.3 million) refurbishment. However, we can reassure residents that safety is our top priority.
Grenfell Tower is a public housing project owned by the local government council and managed by a non-profit known as the Kensington and Chelsea Tenants Management Organisation.
The group's blog post argued that only "a catastrophic event will expose the ineptitude and incompetence of our landlord. and bring an end to the unsafe living conditions and neglect of health and safety legislation that they inflict upon their tenants and leaseholders".
Mayor Khan wrote to May on Friday, saying residents felt increasingly enraged and frustrated by the slow response from the authorities. We will cooperate fully with all the relevant authorities in order to ascertain the cause of this tragedy. Instead they released a statement promising to rehouse as many people locally as they could.
Media captionLondon fire: How can you make tower blocks safe?
There were also angry scenes outside the offices of the Kensington and Chelsea council, which was responsible for managing the 1970s social housing block, in a working-class enclave in one of London's richest areas.