Detectives probing the Grenfell Tower inferno have interviewed three people under caution.
Police are investigating possible breaches of Health and Safety law after 72 people died in the blaze in June last year.
Scotland Yard said more people are likely to be interviewed in the coming weeks as part of the probe which has only seen arrests for alleged fraud offences.
A Met Police spokesman said: “The police investigation into the Grenfell Tower fire has moved to a new phase with a planned programme of interviews under caution.
“So far, three interviews under caution have been carried out in relation to the tragic events and it is likely that further interviews will take place in the coming weeks and months.
“The Metropolitan Police Service is considering offences including gross negligence manslaughter, corporate manslaughter and breaches of the Health and Safety Act.
“Apart from investigations into allegations of fraud, there have not been any arrests at this stage.”
Victims’ families and survivors have been informed as Scotland Yard expects to finish its inquiries at the Tower and hand it over to another public body early next month.
A spokesman said: “The families and survivors have also been informed that the Met Police Service remains on schedule to hand over responsibility for Grenfell Tower as the police work at the tower is nearing completion.
“It is anticipated the handover of the tower is likely to take place in early August.”
Commander Stuart Cundy, said: “The handover of Grenfell Tower by the police will only occur once we are entirely confident that all police work has been completed at the tower and handing the tower over to the responsible body will have no bearing on the ongoing criminal investigation.
“The concerns of the bereaved, survivors and residents as well as the wider community will be central to how the handover takes place. We recognise this will be a significant milestone and one that is bound to stir a range of emotions for all those affected by this tragedy.
“As part of our careful planning for a transition of responsibility, we are working closely with representatives from central government and London Councils.”
Scotland Yard added: “Police and experts have worked tirelessly to ensure that every aspect of the physical examination of Grenfell Tower have been completed to the highest possible standards, including searches, forensic examinations, digital scanning, photography and videography, as well as the examination by many independent experts of specific aspects of the building construction and maintenance systems, on behalf of both the Met and the Grenfell Tower Inquiry.
“This considerable work has been supported by a series of off-site tests and reconstructions.
“Once the Met is entirely satisfied nothing further is required from the tower, responsibility for it will be handed over to the responsible body.
“The Met is working closely with all relevant organisations to make the arrangements.”