He said a police investigation by specialist detectives would "establish the facts to provide, as best we possible, answers for those so deeply and tragically affected by the bad fire at Grenfell Tower".
Firefighters are still searching for victims in the 24-story Grenfell Tower that went up in flames early Wednesday.
Seventeen people are known to have died but that figure is set to rise, with fears the death toll could exceed 60.
As the PM was bundled into a vehicle, just one mile away at Kensington Town Hall protesters stormed the building to demand justice as anger mounts over the disaster.
Details were not disclosed, but an unidentified group spokesman said members had given May their "demands and expectations" and that a full statement would be made only "in the community, with the community".
Tensions were high two days after the overnight fire gutted the huge housing block, killing at least 30 people and leaving dozens missing and hundreds homeless.
"That's one of the most bad things I have ever seen", Prince William said of the tower's blackened shell. We need to have an explanation for this.
"We have identified those buildings and now and over the weekend people are going in and inspecting those buildings".
"People raised these concerns, people were expressing issues regarding the safety and risky living conditions", says Lancaster West Residents Association chairwoman Olesea Matcovschi.
Britain's Queen Elizabeth, opposition leader Jeremy Corbyn and London Mayor Sadiq Khan have all met residents.
Also on Thursday David Lammy, a lawmaker from the opposition Labour Party, called for a criminal investigation of possible "corporate manslaughter" as anger grew over reports that fire-safety concerns were ignored.
The BBC estimates about 76 people are missing based on social media and missing posters, which could include some of the 30 confirmed dead.
Ward, Kovalev do it again in light heavyweight title bout
The look on my face...." This will also be for the WBA Super, IBF, and WBO World Lightweight titles that Ward won in that event. This time I will not be empty - Ward will be fighting Krusher. "Great fighters aren't going to get hit like that".
10 still in critical condition after London fire
Clements Church, where survivors and the loved ones of victims from this week's fire at Grenfell Tower have congregated. Floral tributes and messages for the victims of Grenfell Tower are seen in London , Britain, on June 16, 2017 .
Judge declares mistrial in Bill Cosby's sexual assault case
The case was the only one to result in a criminal trial, largely because the other accusations are now too old to prosecute. Allred said that "we can never underestimate the blinding power of celebrity" and vowed that "justice will come".
Race: Gillespie will face Northam in November
RICHMOND-Ed Gillespie eked out an uncomfortably close victory in Virginia's Republican primary for governor Tuesday while Lt. Gillespie narrowly defeated Stewart in a race that truly came down to the wire and left Gillespie victorious, but only just.
Tapwrit wins Belmont Stakes
As I explain below, the value just isn't there in the favorite tonight, so might as well roll the dice on one of the long-shots. After setting pressured fractions of:23.88, :48.66, 1:14.01, and 1:38.95 through a mile, though, Irish War Cry had enough.
US Fed raises rates, provokes caution in Indian markets
The rise was widely anticipated after a low unemployment rate, but other economic gauges, including inflation, have been weaker. If the Fed Funds rate moves up to 3 percent over the next two years, Shiller said, would bode poorly for Treasurys.
Hussain: Pitch blameless in England's Pakistan loss
Mohammad Kaif, for instance, pointed out that only teams from the sub-continent have made it to the final leg of the tournament . Pakistan will now play the victor of the second semi-final between India and Bangladesh to be played today in Birmingham .
Gloria Allred to Bill Cosby: 'Round 2 is coming'
It ended in a mistrial Saturday morning after the jury spent more than 52 hours in six days sifting through conflicting testimony. Sure, the jurors may have known about the other allegations against Cosby , but perhaps they DID obey the judge's instructions.