"I must consider the fact that there may be others in the building who, for whatever reason have not been reported to us". On Wednesday, the apartment tower caught fire, the cause of which has not been established yet.
National media in London reported extensively Friday that it would have cost just 5,000 pounds (6,400 US dollars) extra for a cladding material with better fire protection qualities.
The cause of Wednesday's blaze is still under investigation, but anger has mounted in the community amid reports that exterior panelling used in an extensive renovation completed past year may have been banned by United Kingdom rules.
Metropolitan Police commander Stuart Cundy confirmed the death toll as he spoke near the scene of the devastating blaze in west London on Friday.
Officials are using dental records, fingerprints and DNA samples to try and positively identify victims.
Survivors of the Grenfell Tower blaze are being given just £10 to live on by the council, a volunteer has said. "And therefore, sadly, I have to assume that they are dead", he said. "It will also be a subject that the criminal investigation will be looking at".
Prince William hugged a victim of Wednesday's deadly west London fire (which now has a death toll of 58 people) when he made a visit to a crisis center on Friday. One opposition lawmaker urged the Conservative government and police to immediately seize all documents related to the tower renovation.
The recovery operation had been paused amid concerns for the safety of emergency workers in the building, but has now resumed. More than 3 million pounds ($3.8 million) have been raised for the victims, and the British government has announced a 5 million-pound ($6.3 million) emergency fund.
He said the community in north Kensington, west London, was "frustrated and, yes, angry".
"I believe there may be people who were in Grenfell Tower that people may not know were missing and may not have realized they were in there on the night".
But she added that because victims had been subject to a "very intense fire" that will made some of the identification "very difficult".
Meanwhile, London mayor Sadiq Khan has said that high-rise tower blocks dating from the 1960s and 1970s could be torn down in the wake of the deadly fire. This relies on dental records, fingerprints and DNA when possible and also features like tattoos or scars.
The queen's official birthday is marked in June when the weather is often nicer than in April, the actual month of her birth. A solemn Elizabeth and her husband Prince Philip held a minute of silence for the fire victims at the start of the procession Saturday.
"It is hard to escape a very somber national mood", the queen said in a statement to mark her official birthday - an occasion that typically does not result in any public comments from the monarch.
There is simmering anger in the multi-ethnic Kensington area hit by the blaze, and public fury has been directed at senior government figures, including Prime Minister Theresa May, when they visited the stricken area.
Meanwhile, dozens of people erupted into Kensington and Chelsea town hall to protest the lack of response following the fire.