Flammable cladding has been found on 75 high-rise buildings across 26 local authority areas tested in the wake of the Grenfell fire disaster.
The so-called combustibility test has been failed by every building examined so far, Sajid Javid, Secretary of State for Communities and Local Government, said.
Describing the Grenfell Tower fire as "a catastrophic failure", he announced the formation of an independent expert advisory panel to advise government on any immediate steps that need to be taken on fire safety.
Addressing the House of Commons on Monday evening he also revealed the Government has pledged AGBP1 million to boost the work done by charities to support those in need since the deadly blaze.
The scope of the forthcoming public inquiry into the fire is expected to widen, examining the apparent widespread use of cladding.
It is not clear at this stage how many buildings could be affected.
Hospitals and schools are being tested to make sure they are not encased in combustible cladding, and Mr Javid said 15 buildings "across the wider Government estate" require further investigation.
Addressing concerns from MPs Mr Javid admitted "multiple fire safety inspection failures" had been discovered in tower blocks which were evacuated last week in Camden.
"Literally hundreds of fire doors were missing" from high-rises there, he said, as he outlined other failures including inaccessible stairways and breaches of internal walls,
Mr Javid paid tribute to residents evacuated in that area for their "brave response to such a distressing situation".
Giving the latest update on cladding tests he said: "I can inform the House that as of midday today the cladding from 75 high-rise buildings in 26 local authority areas has failed the combustibility test."
"The fact that all samples so far have failed underlines the value of the testing programme and the vital importance of submitting samples urgently.
I am concerned about the speed at which samples are being submitted.
I would urge all landlords to submit their samples immediately."
Earlier Theresa May's official spokesman said questions over why the material was used on tower blocks nationwide despite breaching fire safety rules would likely be scrutinised.
"It is clearly a huge concern that this is the case," the spokesman told reporters.
Downing Street earlier said the Department of Health and Department for Education will oversee the testing of schools and hospitals.
