Thirteen interviews have been carried out under caution by detectives investigating the Grenfell Tower fire, police have said.
The questioning is part of an ongoing criminal investigation into the blaze, which broke out on June 14, 2017 and left 72 people dead.
The Metropolitan Police said they would not be disclosing how many individuals the 13 interviews concern, but Scotland Yard confirmed that more interviews were scheduled.
The force added that just over 7,100 statements have been taken from witnesses, community and family members, emergency services personnel and others as part of the probe.
Karim Mussilhy, whose uncle died in the fire, said it showed "some positive steps" were being taken.
Mr Mussilhy, who is also the vice-chairman of the campaign group Grenfell United, said: "It would be interesting to find out who these bodies or organisations or individuals are, but at least it means progress is being made in the criminal investigation.
"We were told that the police investigation would almost run alongside the public inquiry, and obviously we know about all the delays the public inquiry has had, so this is something positive to a certain extent."
Labour MP Emma Dent Coad, who represents Kensington, said it was "just what our community wanted to hear".
In March, police said no charges were likely to be brought for at least the next two years.
The Met said it would be "wrong" not to wait for the final report of the Grenfell Tower Inquiry, which will come after the probe's second phase.
This is not due to start until early next year.