It tore through all floors of the building and took more than 200 firefighters and 24 hours to bring it under control.
The Guardian newspaper reported that contractors installed a cheaper, less flame-resistant type of panelling in the renovation that ended in May 2016. London police expect the death toll to rise further but said it could take months to search the burned-out building and identify the victims.
Mr Cundy said the police investigation into the blaze would look at the building and its refurbishment in 2016 and vowed to prosecute people "if there is evidence". He asked anyone who was in the tower and survived to contact police immediately.
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 identification of the victims is proving very hard - which experts attribute to the extreme heat of the fire. They have have not been seen since the fire.
Friday's visit represents May's second faux-pas in the aftermath of the fire. Those who lost their homes will be rehoused within three weeks, she said. Earlier in the day, the 91-year-old monarch described the country's mood as "somber" but insisted that Britain remained resolute during a hard time. "The PM has sent her best wishes to HM Queen on the event of her birthday".
Why we visited The SUN Newspaper - EFCC
Reacting to the allegation through a statement, the spokesperson of the EFCC, Wilson Uwujaren , described it as diversionary. He said the commission's action was devoid of prejudice to any appeal and only meant to verify the integrity of the assets.
"Wallowing in the wash of a general election that stripped our Prime Minister of her authority on the very eve of European Union negotiations, neither common sense nor the evidence suggest she can re-establish public confidence", wrote Mr Matthew Parris, a columnist and former Conservative lawmaker, in the Times.
On Wednesday, the apartment tower caught fire, the cause of which has not been established yet. It had a plastic core and was similar to that used by high-rise buildings in France, the United Arab Emirates and Australia which had also suffered fires that spread.
The tragedy has provoked a huge response from nearby communities. Numerous displaced are living in churches and community centers.
"As soon as we can, we will locate and recover loved ones", he added.
Two nearby Underground lines were partially shut down Saturday in the fire area to make sure that debris did not land on the tracks.
A woman touches a poster for 12-year-old Jessica Urbano on a tribute wall Friday after laying flowers on the side of a church next to the Grenfell Tower in London.