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A total of 75 high rise buildings in England have failed fire safety tests so far following the Grenfell Tower blaze, according to the Government.
Sajid Javid, Secretary of State for Communities and Local Government, announced the new number, which has been revised upwards from 60, in Parliament.
He also said he had asked all councils and housing authorities in England to inspect tall, residential buildings which potentially have similar cladding to that of Grenfell Tower.
He said there were around 600 such buildings in the country.
"I know the entire country is anxious to hear what we are doing to reassure residents about fire safety in similar blocks around the country," he said.
The programme to test the cladding, a composite of aluminium and which was thought to have helped the Grenfell Tower fire spread quickly, started on 21 June.
The 75 affected buildings are spread across 26 local authority areas.
In Pictures: Grenfell Tower after the fireShow all 51 1 /51In Pictures: Grenfell Tower after the fire In Pictures: Grenfell Tower after the fire Police have released images from inside the tower where at least 58 people have died
Metropolitan Police
In Pictures: Grenfell Tower after the fire A still from a video shared by polices what appears to be a stationary bicycle sitting among the ashes
In Pictures: Grenfell Tower after the fire A still from a video shared by police shows the remnants of a burnt-out bathroom
In Pictures: Grenfell Tower after the fire Picture showing the lifts on an unknown floor
Metropolitan Police
In Pictures: Grenfell Tower after the fire Emergency crews outside the front entrance to the tower
Metropolitan Police
In Pictures: Grenfell Tower after the fire Fire crews inspecting flats in the burnt out tower
London Metropolitan Police
In Pictures: Grenfell Tower after the fire Grenfell Tower is seen in the distance
PA
In Pictures: Grenfell Tower after the fire A drone flies near the scene of the fire which destroyed the Grenfell Tower block
REUTERS/Stefan Wermuth
In Pictures: Grenfell Tower after the fire 'Theresa May Stay Away' message written on the messages of support at Latymer Community Church for those affected by the fire
Ray Tang/REX
In Pictures: Grenfell Tower after the fire An aerial view of the area surrounding Grenfall tower
Getty
In Pictures: Grenfell Tower after the fire Donated shoes sit in the Westway Sports Centre near to the site of the Grenfell Tower fire
Getty Images
In Pictures: Grenfell Tower after the fire Messages of support for those affected by the massive fire in Grenfell Tower are displayed on a well near the tower in London
AP
In Pictures: Grenfell Tower after the fire A local resident stands on her balcony by the gutted Grenfell Tower in Latimer Road
Getty Images
In Pictures: Grenfell Tower after the fire Messages of condolence are left at a relief centre close to the scene of the fire that broke out at Grenfell Tower,
EPA
In Pictures: Grenfell Tower after the fire A police officer stands by a security cordon outside Latimer Road station
Getty Images
In Pictures: Grenfell Tower after the fire Firemen examine the scorched facade of the Grenfell Tower in London on a huge ladder
AP
In Pictures: Grenfell Tower after the fire A search dog is led through the rubble of the Grenfell Tower in London as firefighting continue to damp-down the deadly fire
AP
In Pictures: Grenfell Tower after the fire Labour leader Jeremy Corbyn comforts a local resident (name not given) at St Clement's Church in west London where volunteers have provided shelter and support for people affected by the fire at Grenfell Tower
David Mirzoeff/PA
In Pictures: Grenfell Tower after the fire Labour leader Jeremy Corbyn hugs councillor Mushtaq Lasharie as he arrives at St Clement's Church in Latimer Road, where volunteers have provided shelter and support for people affected by the fire at Grenfell Tower
Getty Images
In Pictures: Grenfell Tower after the fire Labour leader Jeremy Corbyn meeting staff and volunteers at St Clementís Church in Latimer Road
David Mirzoeff/PA
In Pictures: Grenfell Tower after the fire Firefighters with a dog walk around the base of the Grenfell Tower
REUTERS/Peter Nicholls
In Pictures: Grenfell Tower after the fire Emotions run high as people attend a candle lit vigil outside Notting Hill Methodist Church near the 24 storey residential Grenfell Tower block in Latimer Road, West London
Getty Images
In Pictures: Grenfell Tower after the fire Debris hangs from the blackened exterior of Grenfell Tower
Getty Images
In Pictures: Grenfell Tower after the fire A woman speaks to Mayor of London Sadiq Khan outside Notting Hill Methodist Church near Grenfell Tower in west London after a fire engulfed the 24-storey building
Yui Mok/PA Wire
In Pictures: Grenfell Tower after the fire A woman holds a missing person posters near the Grenfell Tower block
REUTERS/Stefan Wermuth
In Pictures: Grenfell Tower after the fire Sadiq Khan speaking with a resident
James Gourley/REX
In Pictures: Grenfell Tower after the fire Ken Livingstone walks near the scene of the Grenfell Tower fire
Getty Images
In Pictures: Grenfell Tower after the fire Mayor of London Sadiq Khan is confronted by Kai Ramos, 7, near Grenfell Tower in west London after a fire engulfed the 24-storey building
Yui Mok/PA Wire
In Pictures: Grenfell Tower after the fire Mayor of London Sadiq Khan speaks to a woman outside Notting Hill Methodist Church near Grenfell Tower
Yui Mok/PA Wire
In Pictures: Grenfell Tower after the fire Volunteers distribute aid near Grenfell Tower
Getty Images
In Pictures: Grenfell Tower after the fire Family and friends of missing Jessica Urbano, 12, wearing photographs of Jessica pinned to their t-shirts gather near Grenfell Tower
EPA
In Pictures: Grenfell Tower after the fire Family and friends of missing Jessica Urbano, 12, wearing photographs of Jessica pinned to their t-shirts gather near Grenfell Tower
EPA
In Pictures: Grenfell Tower after the fire Family and friends of missing Jessica Urbano, 12, wearing photographs of Jessica pinned to their t-shirts gather near Grenfell Tower
EPA
In Pictures: Grenfell Tower after the fire People attend a vigil at Notting Hill Methodist Church near Grenfell Tower
Getty Images
In Pictures: Grenfell Tower after the fire People gather to observe a vigil outside St Clement's Church following the blaze at Grenfell Tower
Getty Images
In Pictures: Grenfell Tower after the fire People light candles as they observe a vigil outside St Clement's Church following the blaze at Grenfell Tower
Getty Images
In Pictures: Grenfell Tower after the fire People attend a vigil at Notting Hill Methodist Church near Grenfell Tower
Getty Images
In Pictures: Grenfell Tower after the fire A man distributes food from the back of a van near the scene of the fire which destroyed the Grenfell Tower block
REUTERS/Paul Hackett
In Pictures: Grenfell Tower after the fire A firefighter is cheered near the scene of the fire which destroyed the Grenfell Tower block
REUTERS/Paul Hackett
In Pictures: Grenfell Tower after the fire A T-shirt with a written message from the London Fire Brigade hangs from a fence near The Grenfell Tower block
REUTERS/Stefan Wermuth
In Pictures: Grenfell Tower after the fire A young girl on her way to lay flowers near Grenfell Tower
Getty Images
In Pictures: Grenfell Tower after the fire The remains of residential tower block Grenfell Tower are seen from Dixon House a nearby tower block
Getty
In Pictures: Grenfell Tower after the fire Volunteers prepare supplies for people affected by the Grenfell Tower block which was destroyed in a fire
REUTERS/Neil Hall
In Pictures: Grenfell Tower after the fire Volunteers move a car to make space for a lorry picking up supplies for people affected by the Grenfell Tower block
REUTERS/Stefan Wermuth
In Pictures: Grenfell Tower after the fire People distribute boxes of food near the scene of the fire which destroyed the Grenfell Tower bloc
REUTERS/Paul Hackett
In Pictures: Grenfell Tower after the fire A woman touches a missing poster for 12-year-old Jessica Urbano on a tribute wall after laying flowers on the side of Latymer Community Church next to the fire-gutted Grenfell Tower
AP
In Pictures: Grenfell Tower after the fire A man looks at messages written on a wall near the scene of the fire which destroyed the Grenfell Tower block
REUTERS/Paul Hackett
In Pictures: Grenfell Tower after the fire Candles and messages of condolence near where the fire broke out at Grenfell Tower
EPA
In Pictures: Grenfell Tower after the fire Police carry a stretcher towards Grenfell Tower
Rick Findler/PA Wire
In Pictures: Grenfell Tower after the fire Emergency services at Grenfell Tower
Rick Findler/PA Wire
In Pictures: Grenfell Tower after the fire Police carry out a body from Grenfell Tower in west London after a fire engulfed the 24-storey building
Rick Findler/PA Wire
"I know members [of Parliament] will rightly want to know if their residents are affected, and my department will publish regular updates on gov.uk."
The combustibility test has three categories and if the building lands in category two or three, it means the cladding does not have limited combustibility.
On Friday evening, around 4,000 people were evacuated from high rise buildings in Camden with similar cladding.
The cladding and insulation material failed fire safety tests after the disaster.
Mr Javid said he was "concerned at the speed" of which landlords were submitting samples of their cladding to be tested, and asked them to do so immediately.
"I'm determined that residents have as much peace of mind as possible in these worrying times," he said. "Landlords must keep residential buildings safe for their tenants."
The blaze at Grenfell Tower spread within half an hour and killed at least 79 people, and Mr Javid said the death toll was expected to increase.
Officials said some victims would never be identified due to the intensity of the fire.
The latest victim to be named was 52-year-old Mary Mendy. Her sister, Betty Jackson, said in a statement that Mendy was "a wonderful sister, an incredible aunt, the best mother any child could have wished for".
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