Ninety-five buildings have failed safety tests introduced after at least 79 people were killed in a fire that ravaged a tower block in west London earlier this month, a spokesman for British Prime Minister Theresa May said on Tuesday.
British officials are conducting tests on some 600 high-rise buildings across England after the fire ravaged the Grenfell Tower block in west London on June 14, prompting public anger over the Conservative government's budget cuts.
"Right now, we are at a position where 95 buildings in 32 local authority areas have now failed the tests and that remains a 100 percent failure rate," the spokesman told reporters.
"The prime minister said there would need to be a major national investigation into what had gone wrong when cladding which is failing the tests had been fitted on buildings across the country over a number of decades."
Last week, some 4,000 residents were forced to evacuate their homes in north London after the fire brigade ruled their blocks were unsafe.
The insurance industry warned the British government of the dangers of flammable external surfaces on buildings a month before the Grenfell Tower fire.
The Association of British Insurers (ABI) said in a statement released after the tragedy that it had been calling on the government to review building fire-safety regulations since 2009 and warned in May that combustible external cladding on high-rises could cause fire to spread.
The British premier launched a public inquiry into the fire and police announced a criminal investigation after the incident.