PM calls for national probe after every high-rise tested reveals flammable cladding

Hoping to prevent another disaster and assuage concerns, the United Kingdom government has urged local authorities and landlords to send samples of external cladding for further testing.

A Fire protection auto stands in front of Bray Tower, part of the Chalcots Estate in the borough of Camden, in London, Monday, June 26, 2017.

The announcement comes as an open letter to May from residents on and around the Grenfell Tower estate in west London warned that the investigation into the fire must leave "no stone unturned". The western German city decided Tuesday to evacuate the 11-story apartment block because of concerns over exterior insulation similar to that of London’s Grenfell Tower.

The Grenfell fire, started by a faulty fridge, spread rapidly up the block, trapping many residents in the upper floors.

The boy, Isaac Paulos, who was identified from his dental records, died from smoke inhalation, the inquest at Westminster Coroner's Court found.

"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".

The Grenfell disaster, and May's initially slow response to it, has stirred widespread anger and intensified criticism of her leadership after a botched snap election that cost her Conservative Party its parliamentary majority.

The exact nature of the Government-backed tests has not been made public, but Mr Javid confirmed samples were being ranked on a scale of one to three - with those in categories two and three considered a failure.

The officer in charge of the police investigation has said exterior cladding at Grenfell Tower had failed all fire safety tests and that police say they would consider criminal charges, including manslaughter, over the fire.

"Timber isn't an insulation product, it's not a filler material, so there's nothing stopping you using timber on a high-rise building, but the Government now are saying that all cladding should be of limited combustibility - there is a massive inconsistency there".

Scotland Yard on Tuesday named Isaac Paulous, releasing a statement from his family that read: "We will all miss our kind, energetic, generous little boy".

Vanessa Coleman