Exterior panelling known as cladding that was recently installed on the 24-storey Grenfell Tower is increasingly being cited as a factor in the blaze that killed at least 30 people and left dozens of others still missing.
Coupled with planned engineering work, the safety concerns around the fire mean the Circle Line is closed.
"There is considerable damage within Grenfell Tower", he said.
He said more bodies remain in the building following the fire. The Guardian newspaper reported Friday that contractors installed a cheaper, less flame-resistant type of paneling in the renovation that ended in May 2016. "However, there may be other people who were in there on the night that others were not aware were there", he said.
The protesters chanted "We want justice" and "bring them out".
While the deadly blaze at the Grenfell Tower in north Kensington has prompted an outpouring of generosity, it has also unleashed fury at the authorities as the charred tower was cast as a deadly symbol of a divided society.
- with files from the Associated Press.
In a statement released on Thursday by the Queen and husband Prince Philip, they sent their "thoughts and prayers" to "families who have lost loved ones in the Grenfell Tower fire and the many people who are still critically ill in hospital".
With anger mounting over the government's handling of the blaze, May on Saturday met residents from the Grenfell Tower and pledged to support the victims as protesters gathered in the streets around her residence for a second day.
She said volunteers were unable to get hold of any money, despite huge donations of cash being made and Theresa May pledging £5 million in emergency funds. "So they put panels, pretty panels on the outside, so the rich people who lived opposite wouldn't have to look at a horrendous block". Victims were going to hotels, arriving at hotels, with no one from the council to greet them, to check them in, to give them clothes and food.
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But the Conservative leader still struggled to overcome accusations that she lacked compassion because she had failed to meet with victims on her first visit to the devastated site.
May has been criticised for her muted response to the fire and had to be rushed away from a meeting with residents on Friday under heavy police guard as protesters shouted "Shame on you".
Using drones and sniffer dogs, firefighters continued to search the burned-out housing block that looms over the low-income community in west London.
Many are demanding answers for how the blaze spread so quickly.
Police Commander Stuart Cundy said Saturday that this number, which was based on reports from the public, may rise.
The government has promised a full public inquiry.
CTMO, the Kensington and Chelsea Management Organization, has managed the building on behalf of local public authorities who own it.
The cause of Wednesday's blaze is still under investigation, but anger has mounted in the community amid reports that exterior paneling used in an extensive renovation completed a year ago may have been banned by United Kingdom rules.
Aluminum composite panels essentially consist of two thin layers of aluminum sandwiched around a lightweight insulating material. One version of the product [has] a polyethylene core, the other version is around a fire-retardant mineral core.