At least 30 people have been confirmed killed and dozens more are feared dead in the London tower block fire, police said on Friday, June 16, as firefighters continued searching for bodies amid outrage over the use of cladding blamed for spreading the flames, AFP said.

"We know that at least 30 people have died as a result of this fire... I do believe the number will increase," police commander Stuart Cundy told reporters in front of the charred Grenfell Tower.

Cundy said police had started a criminal investigation but there was nothing to suggest "that the fire had been started deliberately".

He also said the last flames had finally been put out, two days after the fire broke out in the night between Tuesday and Wednesday in the 24-storey tower in a working-class enclave of the wealthy London borough of Kensington and Chelsea.

More than 70 people are unaccounted for, according to media reports, although it was not known whether some of those were among the bodies recovered so far.

Police have warned some of the victims may never be identified because of the state of the remains.

Cundy said one of the victims was a person who died in hospital. Twenty-four injured survivors are still being treated, 12 of them in critical care.

Firefighters were using drones and sniffer dogs to search the building, saying that some of the upper floors are still inaccessible to humans because of concerns about the stability of the structure.