"But we will do absolutely everything we can with utmost sensitivity and dignity", she said.
Asked if the insulation and aluminium tiles used were acceptable for such buildings, McCormack told reporters: "No they're not".
The city council met yesterday with fire chiefs and housing associations, and reported that further safety tests are being carried out at 28 low to high rise blocks to look at related issues such as sprinkler systems, fire breaks, evacuation plans and fire alarms.
Police says 79 people are either dead or missing and presumed dead in the blaze, although that number may change.
Firefighters and emergency workers who battled the inferno have been leaving messages and tributes to the victims at a makeshift memorial near the charred apartment block. Britain also ordered an immediate technical examination of the Hotpoint fridge model FF175BP, which had not been subject to any recall to establish whether further action should be taken, but said there was no need for owners to switch off their appliances.More news: Syria troops position themselves at heart of war on IS
One tribute, from a firefighter from a station in the Kensington and Chelsea borough read: "20th floor, we tried. we're sorry".
One shirt bearing the London Ambulance Service logo said: "We refuse to forget you".
COUNCIL-RUN buildings in East Lothian "fully comply" with fire safety regulations, according to the local authority.
Authorities now acknowledge the risks posed by exterior cladding to thousands of people around the country who live in blocks like Grenfell Tower.
Detective Superintendent Fiona McCormack says officers have seized documents in the investigation into the fire.More news: Ronaldo summoned to court, Mourinho accused of tax fraud
The detective superintendent also said she is anxious that the authorities might not have a true sense of how many people were in the building, in part because people who lived there or knew someone who did might be fearful of having their immigration status reviewed.
"What we are being told at the moment by the Building Research Establishment is that the cladding and insulation failed all safety tests".
Housing trust Wythenshawe Community Housing Group has started work to remove 78 feature panels at its Village 135 scheme that were identified as using similar material to the cladding panels used at Grenfell Tower.
Investigators will work to examine the construction of the 24-story west London building, including refurbishment and the exterior of the building, as well as the insulation. Samples from 14 buildings in London, Manchester and Plymouth have already been found to be combustible.
The panels were apparently produced in different grades making it different to identify precisely which material may have been used in specific cases, she said.More news: Ronaldo header gives Portugal 1-0 win over hosts Russia