"In 2012 they were told they were deficient and their fire checks were out of date and they did nothing, they did absolutely nothing".
Many residents who evacuated said the fire had spread incredibly quickly with nearly no warning.
Onlookers compared the fire to 9/11 as the 24 floor building was engulfed in flames.
The London tower devastated by a vicious building fire may have been installed with flammable cladding during a recent renovation.
"Anyone who earns below 10 million pounds a year is not human in this borough", he said.
"There are now 12 people that have died that we know of", police commander Stuart Cundy told reporters at the scene.
'We will co-operate with the relevant authorities and emergency services and fully support their inquiries into the causes of this fire at the appropriate time'.
More than 200 firefighters, backed up by 40 fire engines, fought for hours to try to control the blaze, London's deadliest for a generation.
Speaking within sight of the burning high-rise - originally white and gray, but most of which had turned a charred black - Cotton said she would not speculate on the exact number of deaths because of the "size and complexity" of the building.
Firefighters rescued large numbers of people - some of them in their pyjamas - from the 43-year-old block, a low rent housing estate which overlooks up-scale parts of the Kensington area. The Grenfell Tower apartment block was home to about 600 people.
Flames tore up the Tower, leaving people trapped on upper floors, some holding babies from windows and others jumping from their flats.
Mr Martin lives in an apartment block right next to the Grenfell Tower, and went outside when he heard sirens coming from the streets below.
"Sadly I don't anticipate that there will be further survivors".
"If I'd fallen asleep, we would have all been dead ... That cladding - it was just like throwing fuel on the fire." he said...
She said there were concerns that people were still inside the tower and she urged all residents to make sure they had reported themselves to police.
Families of those thought to have been in London's Grenfell Tower are desperately searching for missing loved ones.
It is feared that many have been trapped inside the blazing building, as the fire broke out on early Wednesday.
From the early hours of the morning residents from Grenfell Tower have been housed in various shelters, where food, clothes and water have been deposited by locals in a dramatic outpouring of grief.
"The fire crew, ambulance and police couldn't do anything, they couldn't get in, and they were just telling them to stay where they are, and we'll come and get you. The council are nowhere to be seen", he said.
At St. Clement's Church, where evacuees gathered, Hadra Hassad was trying to find one of her closest friends, who lived on the 21st floor.
"As I was going down the stairs, there were firefighters, truly awesome firefighters that were actually going upstairs, to the fire, trying to get as many people out the building as possible", he told the BBC.
There have been calls for a major investigation amid questions about how the fire spread so rapidly through the block.
Attention has also focused on the concerns long raised about fire safety by the Grenfell Tower Action Group established 7 years ago, and which had chronicled their concerns and efforts to bring about changes on a blog.
"We work with local authorities, developers, and tenants to help ensure that the fire safety arrangements in high rise accommodation are safe and appropriate".