A murder investigation is under way after a woman and three children died in a house fire in Bradford.
The blaze broke out at a property on Westbury Road in the early hours of the morning.
Five fire service crews and police arrived just after 2am, but a 29-year-old woman was pronounced dead at the scene.
Three children – two girls aged nine and one, and a five-year-old boy – were taken to hospital but later died.
A man, 39, was arrested at the scene on suspicion of murder and taken to hospital with critical injuries.
Detective Chief Inspector Stacey Atkinson said: “This is an absolutely devastating incident in which three children and a woman have lost their lives. Our thoughts remain with their family, friends and loved ones.
“Early enquiries show that the fire was started deliberately, and we have arrested one man on suspicion of murder.
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“He is seriously ill in hospital today as a result of injuries caused by the fire.”
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“While our enquiries are at an early stage, we do at this time believe the incident is domestic related,” said DCI Atkinson.
“Specially trained officers are supporting the family, and we are working with local neighbourhood officers to carry out enquiries and provide reassurance in the area.”
Police are appealing for anyone with information, such as doorbell cam video, to get in contact.