Prime Minister Theresa May has ordered a full public inquiry into the massive fire that engulfed a west London block of flats, killing at least 17 people.
That figure is expected to rise, as fire chiefs have said they do not expect to find any more survivors in the burnt-out Grenfell Tower, in north Kensington.
People have been desperately seeking news of missing family and friends.
The Queen earlier said her "thoughts and prayers" are with families.
More than 30 people remain in hospital - 17 of whom are in a critical condition.
Prime Minister Theresa May made a brief private visit to the scene, as questions were being asked about the speed at which the fire spread.
Later, Labour Leader Jeremy Corbyn told community leaders "the truth has to come out" on a separate visit to the site.
Firefighters were called to the 24-storey residential tower in the early hours of Wednesday, at a time when hundreds of people were inside, most of them sleeping.
Many were woken by neighbours, or shouts from below, and fled the building. Fire crews rescued 65 adults and children, but some stayed in their homes, trapped by smoke and flames.
On Thursday morning, London Fire Commissioner Dany Cotton said her crews had identified a "number of people, but we know there will be more".