Some desperate residents pleaded to speak to the queen and her grandson about their plight and the fate of missing children as they left the site, with William promising he would return. Thirty of the victims are confirmed dead.
The death toll is expected to rise with dozens still missing. And obviously that will be a subject that the (public) inquiry will look at.
Families who have lost their homes must be supported, he said, grieving people must be helped and lessons must be learned following the tragedy, including ensuring it is not "so hard" for those who need help to find it.
Syrian refugee Mohammed Al Haj Ali is one of the first identified victims.
Kensington and Chelsea council leader Nicholas Paget-Brown, meanwhile, insisted to the BBC officials had "been working around the clock since Wednesday". He said he was "heartbroken by the tragic fire and the appalling loss of life".
The statement came after May met volunteers and some of the people made homeless by the fire.
Located in the wealthy Kensington neighbourhood, the 24-storey public housing building and its 600 residents stood in stark contrast to the world around them.
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Residents caught up in the fire have previously condemned the relief effort as "absolute chaos".
British outlets said May struggled to offer support or leadership in the wake of the blaze, accusing her of lacking emotional intelligence and calling her "Maybot".
The fire has been a major test for Prime Minister Theresa May, whose Conservative Party is clinging to power after losing majority control of Parliament to a Labour surge in a snap election this month.
On Saturday afternoon, hundreds of protesters gathered in Whitehall to call for her resignation.
British authorities are launching a criminal investigation into the London apartment building fire - as the death toll from the blaze has almost doubled, to 30.