These are the horrifying images that show the deadly fire that claimed the lives of three children and their mother.
Police have arrested a man at the scene on suspicion of murder following the blaze in Brent, northwest London.
Firefighters arrived to Tillett Close, Stonebridge, near Wembley, at 1:22am on Saturday morning.
A 43-year-old woman, a 15-year-old girl and two boys aged eight and four, died at the scene, the Metropolitan Police confirmed.
Their next-of-kin have been informed. 'Our thoughts are with them at this difficult time,' the force added.
Two other members of the same family - a woman in her 70s and a teenage girl - were rushed to hospital by the London Ambulance Service (LAS) with police awaiting updates on their conditions.
A 41-year-old man has been arrested at the scene in connection with the incident and is being held in custody on suspicion of murder.
New pictures from The Mirror show the fire ripping through the family home as firefighters worked for more than two hours to tackle the blaze, the cause of which remains unknown.
These are the horrifying images that show the deadly fire that claimed the lives of three children and their mother in Brent, northwest London in the early hours of Saturday morning
Firefighters arrived to Tillett Close (pictured), near Wembley, at 1:22amand worked for more than two hours to tackle the blaze which destroyed the family home
The interior of the house shows blackened wallpaper and charred furniture
The interior of the house shows blackened wallpaper and charred furniture.
Two three-storey terraced houses were also damaged by the flames.
In a new video the fire can be seen ripping through the building as panicked neighbours gather on a green outside.
Mohamed Labidi, a 38-year-old teacher, who lives on Tillett Close, said he 'can't even look at the house'.
He said he knew the woman, adding that the four victims of the fire were 'really good people'.
'We used to socialise together,' Mr Labidi said. 'I can't even look at the house at the house right now.'
Cecilia Marquis, 60, a caterer at Brentford FC said she was 'stunned by the devastation' of the blaze.
Ms Marquis, who witnessed the fire in her street, said: 'This will leave a devastating impact. I just feel numb.'
In a new video the fire can be seen ripping through the building in the early hours as panicked neighbours gather on a green outside
A red glow could be seen by local residents before the emergency services arrived
A 43-year-old woman and three children, aged 15, eight and four died, the Metropolitan Police confirmed
A 41-year-old man has been arrested at the scene in connection with the incident and is being held in custody
A next door neighbour, who did not wish to be named, said: 'It's horrible, we saw people running outside.
It's hard to process. I only just moved in so it's hard to think about it.'
Superintendent Steve Allen, from the Met's local policing team in northwest London, said: 'This is an extremely tragic incident and our thoughts are with everyone involved.
'Officers arrested a man at the scene and we continue to work alongside investigators from the London Fire Brigade to establish the cause of the fire.'
He added: 'Emergency services will remain in Tillett Close throughout the day as these enquiries take place.'
Reading a further statement to reporters at the scene in Tillett Close, Stonebridge, Superintendent Steve Allen from the Met's local policing team in north-west London said: 'I can confirm a woman and three of her children died at the scene.
'A further two members of the same family were taken to hospital and continue to receive treatment.'
He added: 'The wider family have been informed, and officers will continue to support them at this incredibly difficult time.'
Eight fire engines and around 60 firefighters responded to the blaze, the London Fire Brigade confirmed
'Crews wearing breathing apparatus were able to rescue the woman and one of the children from the second floor, but they were later declared deceased at the scene,' LFB assistant commissioner Keeley Foster said
The fire was under control by around 3.25am, the service added
'We remain in the early stages of our investigation. However, one man was arrested outside the house. He remains in custody and is being questioned by officers.
I recognise the significant impact this incident has had on the community. We are working closely with local authority partners and will have officers in Tillett Close throughout the day. I would ask anyone with information about what happened to contact us by calling 101 or speaking to officers at the scene.'
Eight fire engines and around 60 firefighters responded to the blaze early on Saturday morning, the London Fire Brigade confirmed.
Met Police officers were later called to assist at the scene and the fire was under control by around 3.25am, the service added.
Pictures show two terrace houses, each with three floors, were involved in the fire.
LFB assistant commissioner Keeley Foster said: 'Upon arrival, firefighters were met with a well-developed fire involving two adjoining properties.
'Crews immediately set to work carrying out firefighting operations in order to bring the incident under control.
'Sadly, a woman and three children have died as a result of this fire.'
Superintendent Steve Allen confirmed that 'emergency services will remain in Tillett Close throughout the day'
London Ambulance Service (LAS) said the air ambulance, incident response officers, an advanced paramedic and hazardous area response team were deployed
A spokesperson from the LAS said: 'Our crews treated six patients at the scene, assessed a further six, and another was treated by police'
'Crews wearing breathing apparatus were able to rescue the woman and one of the children from the second floor, but they were later declared deceased at the scene.
A further two children were discovered to have died in the fire, as crews carried out a search of the properties involved.'
She added: 'This is an extremely tragic incident, and the thoughts of everyone across the brigade are with those impacted by this incident.'
London Ambulance Service (LAS) said the air ambulance, incident response officers, an advanced paramedic and hazardous area response team were deployed.
A spokesperson from the LAS said: 'Our crews treated six patients at the scene, assessed a further six, and another was treated by police.'
'Sadly, despite our best efforts and those of our emergency partners, four people were pronounced dead at the scene.'
'A further two were taken to hospital.'
Mayor of London Sir Sadiq Khan said in a post on X: 'This is devastating news and my thoughts are with the family, friends and wider community of the four people who sadly have lost their lives.'
'Sadly, despite our best efforts and those of our emergency partners, four people were pronounced dead at the scene'
'I remain in close contact with the London Fire Brigade and Metropolitan Police as they work to establish the cause of the fire and offer support to all those impacted.'
Dawn Butler, the local Labour MP for Brent East, said in a post on X: 'Devastated to see the fatal fire at homes in Tillett Close last night.'
'My prayers are with the family and friends affected by this is a very sad tragedy.'
She added:'@LFB-Brent worked hard to get it under control, thank you.'
Anyone with information is asked to call 101 quoting CAD 509/24May or anonymously through Crimestoppers online or by calling 0800 555 111.