"We've worked tirelessly to establish how many people we believe were in Grenfell Tower on the night and at this point in time we are unable to say that they are safe or well", he said.
Hands and Treasury chief Philip Hammond said in separate TV appearances that the cladding used on Grenfell seems to be prohibited by British regulations. British media have reported that contractors installed a cheaper, less flame-resistant type of exterior paneling on the 24-story tower in a renovation that was completed just previous year.
The 1974 concrete building had recently been fitted with new insulation cladding.
Khan described the fire as a "preventable accident that didn't need to happen", adding that the "tragedy we're seeing is a outcome of the mistakes and neglect from politicians from the council and from the government". The building was gutted by a fast-moving fire early Wednesday, claiming at least 58 lives.
"The prime minister is this morning chairing a cross-government meeting to ensure everything possible is being done to support those affected by the Grenfell tragedy", the spokesman said.
Writing in the Observer newspaper, Khan says it may well be the "defining outcome of this tragedy that the worst mistakes" of that era become a thing of the past.
"Within the community, trust in the authorities is falling through the floor and a suspicion of a cover-up is rising", said Lammy, who lost a close friend in the fire. He has not provided details about the inquiry.
As anger continued in the wake of the disaster, described by London mayor Sadiq Khan as a "preventable accident", the government announced on Sunday that those left homeless will be given at least £5,500 (€6,300) from an emergency fund.
Residents say they were ignored and want the government to take responsibility.
Anger among residents has been mounting in recent days as information about the missing has been scant and efforts to find temporary housing have faltered.
Prime Minister Theresa May, who ordered a public inquiry into the disaster, was criticized on Thursday for visiting the scene of the fire, but talking to officials rather than victims or survivors. She also said she will receive daily reports from the stricken neighborhood. Counsellors are already working with 52 families.
His family said Alhajali came to the United Kingdom because he had ambitions and aims for his life and for his family..
He said a police investigation by specialist detectives would "establish the facts to provide, as best we possible, answers for those so deeply and tragically affected by the bad fire at Grenfell Tower".