LONDON (AP) - Police are considering filing manslaughter charges related to the fire at a west London apartment tower that killed at least 79 people.
She repeated calls for members of the public with information about people who may have been in the tower at the time of the fire to come forward.
"We now have expert evidence that the fire was not started deliberately - the fire started in a fridge freezer - the make and model is a Hotpoint FF175BP", Detective Superintendent Fiona McCormack said Friday.
McCormack said the fridge freezer, a Hotpoint FF175BP model, had not been subject to any product recall.
Buildings in London, Manchester and Plymouth are among those where problem cladding has been identified.
The cladding is being studied amid fears that the panels fueled the fire in the 24-story building since it was engulfed in less than an hour.
Ms McCormack said the tests carried out as part of the investigation were "small scale", but added: "All I can say at the moment is they (tiles and insulation) don't pass any safety tests".
Such were their concerns after the tests that the information was immediately shared with government to disseminate more widely.
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In a speech following the queen, May apologized for how her government handled the aftermath of the tragedy. Buckingham Palace said Philip, 96, was hospitalized as a precaution for treatment of an infection.
"We are looking at every criminal offence, from manslaughter onwards".
Hundreds of further buildings are being tested by the Government to see if they pose a fire threat.
"Preliminary tests show the insulation samples collected from Grenfell Tower combusted soon after the test started", she said.
"What we're being told now by the Building Research Establishment is the cladding failed all safety tests". "That's the number I'm really anxious about", McCormack said.
These include round-the-clock fire patrols on estate corridors and additional fire safety checks, it said.
Rosie Closier said the situation had added to her fears, saying she was "a lot more anxious because we already planned what we're going to do if there was a fire when I do have my baby".
Chelsea chairman Bruce Buck added: "It was with profound shock and sorrow we learnt of the tragedy that befell so many people in Kensington last week".
"Since the incident at Grenfell Tower occurred, we've been working closely with Barclays to ensure that all DFS customers with finance agreements have their outstanding balances cancelled".