Two more people have been arrested on suspicion of murder over a house fire that killed a mother and three children in Bradford.
West Yorkshire Police said officers executed a number of warrants in the Keighley area of the city on Friday, over the blaze in Westbury Road on Wednesday.
Bryonie Gawith, 29, was found dead at the scene, and her three children, Denisty Birtle, nine, Oscar Birtle, five, and Aubree Birtle, 22 months, all died later in hospital.
Police said two men aged 35 and 46 were arrested on suspicion of murder and remain in custody.
A 39-year-old man who was arrested at the scene on Wednesday on suspicion of murder remains in hospital in a critical condition.
There are police searches at a number of addresses on Carlby Grove, Carlton Street, Malsis Road and Minnie Street.
Senior investigating officer Detective Chief Inspector Stacey Atkinson of the homicide and major inquiry team said: “Extensive inquiries remain ongoing today in what is very much a live and active investigation.
“Specialist officers are continuing to support the family. They are understandably devastated at their loss, and we would ask that their privacy is respected.
“We are continuing to appeal for any information in relation to the fire, and keen to speak to anyone who might have any information to come forward.”